人教版七年级英语下册
Unit5 Here and Now单元语法填空专项训练
请根据括号里单词的正确形式填空。
Listen! The birds ________ (sing) in the trees.
Look! The children ________ (play) football on the playground.
Right now, my mother ________ (cook) dinner in the kitchen.
At the moment, he ________ (work) on his project at school.
I'm sorry, I can't answer the phone. I ________ (take) a shower.
They ________ (not watch) TV now. They are doing their homework.
—What are you doing —I ________ (read) a very interesting book.
She ________ (ride) her bike to school every day, but today she ________ (take) the bus.
My father usually ________ (drive) to work, but now he ________ (walk) because his car is broken.
Listen! Somebody ________ (knock) at the door. Can you go and see who it is
The students ________ (have) an exam now. They need to be quiet.
It's 8:00 pm. Many people in the city ________ (rush) home from work.
The sun ________ (shine) brightly and the birds are singing. It's a beautiful day.
The Dragon Boat Festival is coming. People ________ (prepare) for it. Some are making zongzi and some are getting the dragon boats ready.
She wants to call her friend, but her friend ________ (not answer) the phone. Maybe she is busy.
—Are you free now —No, I'm not. I ________ (look forward to) the coming holiday and making some plans.
They are in a hurry because they ________ (be) late for the movie.
The kids ________ (not play) outside at the moment. It's raining heavily.
He is a taxi driver. He often ________ (pick up) and ________ (drop off) passengers.
My mother is good at gardening. She often ________ (plant) beautiful flowers in our garden. Now she ________ (water) them.
In different time zones around the world, people ________ (do) different things right now.
It's 7:00 am in New York. Some people ________ (jog) in Central Park, and some ________ (drink) coffee at the coffee shops.
The students are taking part in a painting competition. Each of them ________ (try) their best to draw the most beautiful picture.
Look! The colorful boats ________ (move) slowly down the river. It's a wonderful sight.
She usually goes shopping alone, but today she ________ (shop) with her friends.
At present, the workers ________ (build) a new bridge in our city.
My little brother ________ (always ask) me all kinds of strange questions.
Listen! The teacher ________ (explain) the difficult problem to the students.
My sister is online. She ________ (chat) with her friends on WeChat.
They ________ (not be) at home now. They are visiting their grandparents in the countryside.
I'm sorry, but I can't talk to you long. I ________ (rush) to catch the train.
The children are excited because they ________ (go on) a tour next week.
It's not easy for him ________ (learn) a new language, but he ________ (make) great progress now.
Look! The baby panda ________ (eat) bamboo leaves. It's so lovely.
The students are all busy because they ________ (prepare) for the final exam.
She ________ (not like) to go out at night, but tonight she ________ (walk) in the park with her parents.
My father often ________ (watch) sports on TV, but now he ________ (watch) a documentary about animals.
The train is arriving soon. Passengers ________ (get) ready to get off.
Every morning, my mother ________ (make) breakfast for the family. Now she ________ (make) sandwiches.
They ________ (play) basketball when it suddenly started to rain.
The little girl ________ (always lose) her things. Her mother is worried about her.
He ________ (be) good at math, and now he ________ (help) his classmate with math problems.
At the moment, the famous singer ________ (give) a concert. Many fans are cheering for him.
I usually get up early, but today I ________ (sleep) late because it's Sunday.
The workers are tired, but they ________ (not stop) working. They want to finish the job on time.
She is a hard - working student. She ________ (always study) hard and now she ________ (review) her lessons for the coming test.
Listen! The band ________ (play) some wonderful music. Let's go and listen.
The students are having a discussion. They ________ (talk) about their favorite books.
It's 3:00 pm in Nairobi. Some people ________ (work) in their offices, and some ________ (shop) in the markets.
My mother ________ (cook) delicious food for us every day. Now she ________ (cook) my favorite dish.
They are on a trip. They ________ (visit) many interesting places these days.
The dog ________ (run) after a cat in the garden now.
He often goes to the park to exercise, and now he ________ (jog) there.
She usually does her homework in the evening, but now she ________ (watch) a movie.
The sun is shining and the wind ________ (blow) gently. It's a perfect day for a picnic.
The teacher is angry because some students ________ (not listen) to him in class.
My father is a doctor. He often ________ (help) patients. Now he ________ (examine) a patient.
They ________ (travel) around the world. So far, they have visited many countries.
The children are happy because they ________ (play) games together.
The old man ________ (sit) under the tree and reading a newspaper at the moment.
Look! The plane ________ (fly) in the sky. It's so high.
My sister loves music. She often ________ (listen) to music, and now she ________ (listen) to her favorite song.
At present, the company ________ (develop) a new product.
He ________ (write) a story these days. He hopes to finish it soon.
The students are having a PE class. Some ________ (run), some ________ (play) basketball.
She is a dancer. She often ________ (practice) dancing, and now she ________ (practice) a new dance move.
Listen! The rain ________ (beat) against the window. It's a bit scary.
They are in a hurry to the airport because their flight ________ (take off) soon.
My little brother is naughty. He ________ (always break) things at home.
The birds are singing and the flowers ________ (bloom). It's a beautiful spring scene.
She usually gets up at 6:00, but today she ________ (get up) at 7:00 because she doesn't need to go to school.
The students are cleaning the classroom. Some ________ (sweep) the floor, some ________ (clean) the windows.
My father ________ (drive) to work every day. Now he ________ (drive) on the highway.
They are having a party. Everyone ________ (have) a great time.
The workers are building a new school. They ________ (work) hard to finish it before the new term starts.
The baby is crying. Maybe he ________ (be hungry).
I'm waiting for my friend. She ________ (come) soon.
The boy ________ (always forget) to bring his homework to school. His teacher is disappointed.
She likes reading. She often ________ (borrow) books from the library, and now she ________ (read) a novel.
The train ________ (arrive) at the station in five minutes. We need to hurry up.
The children are playing in the playground. Some ________ (swing), some ________ (slide).
He is a musician. He often ________ (compose) music, and now he ________ (compose) a new song.
Listen! The clock ________ (strike) twelve. It's time to go to bed.
They are on a boat trip. They ________ (enjoy) the beautiful scenery along the river.
My mother is a teacher. She often ________ (teach) English, and now she ________ (teach) a new lesson.
The sun ________ (set) in the west. It's getting dark.
The students are having a science experiment. They ________ (observe) the changes carefully.
She is a good singer. She often ________ (perform) on stage, and now she ________ (perform) a classic song.
The workers are loading the goods onto the truck. They ________ (work) very fast.
He is a writer. He often ________ (write) stories for children, and now he ________ (write) a new storybook.
The kids are making a snowman. They ________ (laugh) and ________ (play) in the snow.
The plane is taking off. Passengers ________ (fasten) their seat belts.
She usually goes to the gym to exercise, but today she ________ (exercise) at home.
The teacher is giving a lecture. The students ________ (listen) attentively.
The farmers are harvesting the crops. They ________ (be busy) in the fields.
The little girl is afraid of the dark. She ________ (always sleep) with the light on.
The dog is barking. It seems that it ________ (see) something strange.
They are having a barbecue in the backyard. They ________ (cook) delicious food and ________ (chat) happily.
The artist is drawing a picture. He ________ (use) different colors to make it vivid.
The train is moving. The passengers ________ (look out) of the windows, enjoying the scenery.答案解析
are singing解析：标志词“Listen!”提示动作正在进行，用现在进行时“be + doing”；主语“the birds”是复数，be动词用“are”，“sing”的现在分词为“singing”。
are playing解析：标志词“Look!”表明动作正在发生，现在进行时结构；主语“the children”为复数，be动词用“are”，“play”的现在分词是“playing”。
is cooking解析：时间状语“Right now”（此刻）是现在进行时的标志，主语“my mother”是单数第三人称，be动词用“is”，“cook”的现在分词为“cooking”。
is working解析：“At the moment”（目前）提示现在进行时，主语“he”是单数第三人称，be动词用“is”，“work”的现在分词为“working”。
am taking解析：前句表明“无法接电话”，隐含动作正在进行，用现在进行时；主语是第一人称“I”，be动词用“am”，“take”的现在分词为“taking”。
are not watching / aren't watching解析：标志词“now”提示现在进行时，否定形式为“be + not + doing”；主语“they”是复数，be动词用“are”，缩写为“aren't”。
am reading解析：问句“What are you doing ”明确询问当前动作，答句需用现在进行时；主语“I”搭配be动词“am”，“read”的现在分词为“reading”。
rides; is taking解析：第一空“every day”（每天）表示习惯性动作，用一般现在时，主语“she”是单数第三人称，“ride”变“rides”；第二空“today”（今天，此处指当前状态）提示现在进行时，be动词用“is”，“take”的现在分词为“taking”。
drives; is walking解析：第一空“usually”（通常）表习惯性动作，一般现在时，主语“my father”是单数第三人称，“drive”变“drives”；第二空“now”提示现在进行时，be动词用“is”，“walk”的现在分词为“walking”。
is knocking解析：标志词“Listen!”提示动作正在进行，主语“somebody”（某人）视为单数，be动词用“is”，“knock”的现在分词为“knocking”。
are having解析：“now”提示现在进行时，主语“the students”是复数，be动词用“are”，“have”的现在分词为“having”（单元核心词汇，“have an exam”表示“参加考试”）。
are rushing解析：“It's 8:00 pm”明确当前时间点，动作正在发生，用现在进行时；主语“many people”是复数，be动词用“are”，“rush”的现在分词为“rushing”（单元核心词汇，“rush home”表示“赶回家”）。
is shining解析：后句“the birds are singing”用现在进行时，前句描述同步进行的动作，也用现在进行时；主语“the sun”是单数，be动词用“is”，“shine”的现在分词为“shining”。
are preparing解析：前句“端午节即将到来”，后句描述人们当前的准备动作，用现在进行时；主语“people”是复数，be动词用“are”，“prepare”的现在分词为“preparing”（单元核心词汇，“prepare for”表示“为……做准备”）。
is not answering / isn't answering解析：后句“Maybe she is busy”（可能她正忙）提示当前动作未发生，用现在进行时否定式；主语“her friend”是单数，be动词用“is”，否定为“isn't”。
am looking forward to解析：问句“Are you free now ”提示当前状态，答句“规划假期”是正在进行的动作，用现在进行时；主语“I”搭配“am”，“look forward to”（期待）的现在分词为“looking forward to”（单元核心短语）。
are going to be / will be解析：“in a hurry”（着急）的原因是“即将迟到”，表将来计划或必然趋势，用“be going to + 动词原形”或“will + 动词原形”；主语“they”是复数，be动词用“are”。
are not playing / aren't playing解析：“at the moment”（此刻）提示现在进行时，后句“下大雨”说明动作未发生，用否定式；主语“the kids”是复数，be动词用“are”，否定为“aren't”。
picks up; drops off解析：“often”（经常）表习惯性动作，用一般现在时；主语“he”是单数第三人称，“pick up”（接人）和“drop off”（送人）均为单元核心短语，动词变“picks”“drops”。
plants; is watering解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“she”是单数第三人称，“plant”变“plants”；第二空“now”提示现在进行时，be动词用“is”，“water”的现在分词为“watering”（单元核心词汇，“water”此处为动词“浇水”）。
are doing解析：“right now”（此刻）提示现在进行时，主语“people”是复数，be动词用“are”，“do”的现在分词为“doing”。
are jogging; are drinking解析：“It's 7:00 am in New York”明确当前时间点，描述同步进行的两个动作，均用现在进行时；主语“some people”“some”（指代部分人）均为复数，be动词用“are”，“jog”（慢跑）、“drink”的现在分词分别为“jogging”“drinking”。
is trying解析：前句“参加绘画比赛”提示当前动作，用现在进行时；“each of them”（他们中的每一个）视为单数，be动词用“is”，“try”的现在分词为“trying”（单元核心短语，“try one's best”表示“尽某人最大努力”）。
are moving解析：标志词“Look!”提示现在进行时，主语“the colorful boats”是复数，be动词用“are”，“move”的现在分词为“moving”。
is shopping解析：“usually”（通常）与“today”（今天）对比，“today”此处指当前动作，用现在进行时；主语“she”是单数第三人称，be动词用“is”，“shop”的现在分词为“shopping”。
are building解析：“At present”（目前）提示现在进行时，主语“the workers”是复数，be动词用“are”，“build”的现在分词为“building”（单元核心词汇）。
always asks解析：“always”（总是）表习惯性动作，用一般现在时；主语“my little brother”是单数第三人称，“ask”变“asks”。
is explaining解析：标志词“Listen!”提示现在进行时，主语“the teacher”是单数第三人称，be动词用“is”，“explain”的现在分词为“explaining”（单元核心词汇，“explain the problem”表示“讲解问题”）。
is chatting解析：前句“is online”（在线）提示当前状态，后句动作正在进行，用现在进行时；主语“she”是单数第三人称，be动词用“is”，“chat”的现在分词为“chatting”（单元核心词汇，“chat with”表示“和……聊天”）。
are not / aren't解析：“now”提示当前状态，用现在进行时的否定（此处省略“staying”等动词，因后句已说明“在乡下拜访祖父母”，避免重复）；主语“they”是复数，be动词用“are”，否定为“aren't”。
am rushing解析：前句“can't talk to you long”（不能聊太久）隐含当前动作，用现在进行时；主语“I”搭配“am”，“rush”的现在分词为“rushing”（单元核心词汇，“rush to catch the train”表示“赶火车”）。
are going on解析：“next week”（下周）表将来，但“are excited”（兴奋）的原因是“正期待旅行”，用现在进行时表“即将发生的计划”；主语“they”是复数，be动词用“are”，“go on a tour”（去旅行）为单元核心短语，现在分词为“going on”。
to learn; is making解析：第一空“it's + 形容词 + for sb. to do sth.”是固定句型，“to learn”为动词不定式；第二空“now”提示现在进行时，主语“he”是单数第三人称，be动词用“is”，“make”的现在分词为“making”（单元核心短语，“make progress”表示“取得进步”）。
is eating解析：标志词“Look!”提示现在进行时，主语“the baby panda”是单数，be动词用“is”，“eat”的现在分词为“eating”（单元核心词汇“bamboo leaves”表示“竹叶”）。
are preparing解析：“are busy”（忙碌）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“prepare”的现在分词为“preparing”（“prepare for the final exam”表示“准备期末考试”，单元核心语境）。
doesn't like; is walking解析：第一空“not like”表习惯性喜好，用一般现在时否定，主语“she”是单数第三人称，助动词用“doesn't”，后接动词原形“like”；第二空“tonight”（今晚，此处指当前）提示现在进行时，be动词用“is”，“walk”的现在分词为“walking”。
watches; is watching解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“my father”是单数第三人称，“watch”变“watches”；第二空“now”提示现在进行时，be动词用“is”，“watch”的现在分词为“watching”。
are getting解析：“The train is arriving soon”（火车即将到站）提示乘客当前的准备动作，用现在进行时；主语“passengers”是复数，be动词用“are”，“get ready”（准备好）为单元核心短语，现在分词为“getting”。
makes; is making解析：第一空“Every morning”（每天早上）表习惯性动作，一般现在时，主语“my mother”是单数第三人称，“make”变“makes”；第二空“now”提示现在进行时，be动词用“is”，“make”的现在分词为“making”。
were playing解析：“when it suddenly started to rain”（当突然下雨时）是过去时间点，主句动作“打篮球”在此时正在进行，用过去进行时“was/were + doing”；主语“they”是复数，be动词用“were”，“play”的现在分词为“playing”。
always loses解析：“always”（总是）表习惯性动作，用一般现在时；主语“the little girl”是单数第三人称，“lose”变“loses”（单元核心词汇，“lose things”表示“丢东西”）。
is; is helping解析：第一空“be good at”（擅长）表常态特征，用一般现在时，主语“he”是单数，be动词用“is”；第二空“now”提示现在进行时，be动词用“is”，“help”的现在分词为“helping”。
is giving解析：“At the moment”（此刻）提示现在进行时，主语“the famous singer”是单数，be动词用“is”，“give”的现在分词为“giving”（“give a concert”表示“举办音乐会”，单元核心语境）。
am sleeping解析：“usually get up early”（通常早起）与“today”（今天，因是周日）对比，当前动作“睡懒觉”正在进行，用现在进行时；主语“I”搭配“am”，“sleep”的现在分词为“sleeping”。
are not stopping / aren't stopping解析：前句“tired”（累）与后句“想按时完成工作”对比，当前动作“未停止”，用现在进行时否定；主语“they”是复数，be动词用“are”，否定为“aren't”，“stop”的现在分词为“stopping”。
always studies; is reviewing解析：第一空“always”（总是）表习惯性动作，一般现在时，主语“she”是单数第三人称，“study”变“studies”；第二空“now”提示现在进行时，be动词用“is”，“review”的现在分词为“reviewing”（“review lessons”表示“复习功课”，单元核心短语）。
is playing解析：标志词“Listen!”提示现在进行时，主语“the band”（乐队）视为单数，be动词用“is”，“play”的现在分词为“playing”（“play music”表示“演奏音乐”，单元核心语境）。
are talking解析：前句“having a discussion”（正在讨论）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“talk”的现在分词为“talking”（“talk about”表示“谈论”，单元核心短语）。
are working; are shopping解析：“It's 3:00 pm in Nairobi”明确当前时间点，描述同步进行的两个动作，均用现在进行时；主语“some people”“some”均为复数，be动词用“are”，“work”“shop”的现在分词分别为“working”“shopping”。
cooks; is cooking解析：第一空“every day”（每天）表习惯性动作，一般现在时，主语“my mother”是单数第三人称，“cook”变“cooks”；第二空“now”提示现在进行时，be动词用“is”，“cook”的现在分词为“cooking”。
are visiting解析：“these days”（这些天）表示“近期持续进行的动作”，用现在进行时；主语“they”是复数，be动词用“are”，“visit”的现在分词为“visiting”（“visit interesting places”表示“参观有趣的地方”，单元核心语境）。
is running解析：“now”提示现在进行时，主语“the dog”是单数，be动词用“is”，“run”的现在分词为“running”（“run after”表示“追赶”，单元核心短语）。
is jogging解析：前句“often goes to the park”（经常去公园）表习惯，后句“now”提示当前动作，用现在进行时；主语“he”是单数第三人称，be动词用“is”，“jog”的现在分词为“jogging”。
is watching解析：“usually does her homework”（通常做作业）与“now”对比，当前动作“看电影”正在进行，用现在进行时；主语“she”是单数第三人称，be动词用“is”，“watch”的现在分词为“watching”。
is blowing解析：前句“the sun is shining”用现在进行时，后句描述同步的“风吹”动作，也用现在进行时；主语“the wind”是单数，be动词用“is”，“blow”的现在分词为“blowing”。
are not listening / aren't listening解析：前句“teacher is angry”（老师生气）提示当前动作“没听讲”，用现在进行时否定；主语“some students”是复数，be动词用“are”，否定为“aren't”。
helps; is examining解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“my father”是单数第三人称，“help”变“helps”；第二空“now”提示现在进行时，be动词用“is”，“examine”的现在分词为“examining”（“examine a patient”表示“检查病人”，单元核心语境）。
are traveling解析：“So far, they have visited many countries”（到目前为止已参观多国）提示“旅行”动作仍在持续，用现在进行时表“近期持续的动作”；主语“they”是复数，be动词用“are”，“travel”的现在分词为“traveling”。
are playing解析：“are happy”（开心）的原因是“正在一起玩游戏”，用现在进行时；主语“they”是复数，be动词用“are”，“play”的现在分词为“playing”。
is sitting解析：“at the moment”（此刻）提示现在进行时，主语“the old man”是单数，be动词用“is”，“sit”的现在分词为“sitting”（与“reading”并列，省略第二个“is”，保持句式简洁）。
is flying解析：标志词“Look!”提示现在进行时，主语“the plane”是单数，be动词用“is”，“fly”的现在分词为“flying”。
listens; is listening解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“she”是单数第三人称，“listen”变“listens”；第二空“now”提示现在进行时，be动词用“is”，“listen”的现在分词为“listening”（“listen to music”表示“听音乐”，单元核心短语）。
is developing解析：“At present”（目前）提示现在进行时，主语“the company”是单数，be动词用“is”，“develop”的现在分词为“developing”（“develop a new product”表示“研发新产品”，单元核心语境）。
is writing解析：“these days”（这些天）表示“近期持续进行的动作”，用现在进行时；主语“he”是单数第三人称，be动词用“is”，“write”的现在分词为“writing”。
are running; are playing解析：前句“having a PE class”（正在上体育课）提示当前动作，用现在进行时；主语“some”（指代部分学生）均为复数，be动词用“are”，“run”“play”的现在分词分别为“running”“playing”。
practices; is practicing解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“she”是单数第三人称，“practice”变“practices”；第二空“now”提示现在进行时，be动词用“is”，“practice”的现在分词为“practicing”（“practice dancing”表示“练习跳舞”，单元核心短语）。
is beating解析：标志词“Listen!”提示现在进行时，主语“the rain”是单数，be动词用“is”，“beat”的现在分词为“beating”（“beat against the window”表示“敲打窗户”，单元核心语境）。
is going to take off / will take off解析：“are in a hurry to the airport”（着急去机场）的原因是“航班即将起飞”，表将来计划，用“be going to + 动词原形”或“will + 动词原形”；主语“their flight”是单数，be动词用“is”，“take off”（起飞）为单元核心短语。
always breaks解析：“always”（总是）表习惯性动作，用一般现在时；主语“my little brother”是单数第三人称，“break”变“breaks”（“break things”表示“打碎东西”，单元核心语境）。
are blooming解析：前句“the birds are singing”用现在进行时，后句描述同步的“花开”动作，也用现在进行时；主语“the flowers”是复数，be动词用“are”，“bloom”的现在分词为“blooming”（单元核心词汇，“开花”）。
is getting up解析：“usually gets up at 6:00”（通常6点起）与“today”（今天，因不用上学）对比，当前动作“7点起”正在进行，用现在进行时；主语“she”是单数第三人称，be动词用“is”，“get up”的现在分词为“getting up”（单元核心短语）。
are sweeping; are cleaning解析：前句“cleaning the classroom”（正在打扫教室）提示当前动作，用现在进行时；主语“some”均为复数，be动词用“are”，“sweep”（扫地）、“clean”（打扫）的现在分词分别为“sweeping”“cleaning”。
drives; is driving解析：第一空“every day”（每天）表习惯性动作，一般现在时，主语“my father”是单数第三人称，“drive”变“drives”；第二空“now”提示现在进行时，be动词用“is”，“drive”的现在分词为“driving”。
is having解析：前句“having a party”（正在举办派对）提示当前动作，用现在进行时；主语“everyone”（每个人）视为单数，be动词用“is”，“have”的现在分词为“having”（“have a great time”表示“玩得开心”，单元核心短语）。
are working解析：前句“building a new school”（正在建学校）提示当前动作，后句“before the new term starts”（开学前）强调动作持续进行，用现在进行时；主语“they”是复数，be动词用“are”，“work”的现在分词为“working”。
is hungry解析：前句“the baby is crying”（宝宝在哭）推测原因“可能饿了”，用一般现在时表当前状态；主语“he”是单数，be动词用“is”，“hungry”（饿的）为单元核心形容词。
is coming解析：“I'm waiting for my friend”（我在等朋友）提示“朋友即将到来”，用现在进行时表“即将发生的动作”；主语“she”是单数第三人称，be动词用“is”，“come”的现在分词为“coming”。
always forgets解析：“always”（总是）表习惯性动作，用一般现在时；主语“the boy”是单数第三人称，“forget”变“forgets”（“forget to bring homework”表示“忘记带作业”，单元核心语境）。
borrows; is reading解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“she”是单数第三人称，“borrow”变“borrows”（“borrow books from the library”表示“从图书馆借书”，单元核心短语）；第二空“now”提示现在进行时，be动词用“is”，“read”的现在分词为“reading”。
is going to arrive / will arrive解析：“in five minutes”（五分钟后）是将来时间标志，表“即将到达”，用“be going to + 动词原形”或“will + 动词原形”；主语“the train”是单数，be动词用“is”，“arrive”（到达）为单元核心词汇。
are swinging; are sliding解析：前句“playing in the playground”（在操场玩）提示当前动作，用现在进行时；主语“some”均为复数，be动词用“are”，“swing”（荡秋千）、“slide”（滑滑梯）的现在分词分别为“swinging”“sliding”（单元核心词汇，对应操场活动）。
composes; is composing解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“he”是单数第三人称，“compose”变“composes”（“compose music”表示“作曲”，单元核心语境）；第二空“now”提示现在进行时，be动词用“is”，“compose”的现在分词为“composing”。
is striking解析：标志词“Listen!”提示现在进行时，主语“the clock”是单数，be动词用“is”，“strike”的现在分词为“striking”（“strike twelve”表示“敲12点”，单元核心语境）。
are enjoying解析：前句“on a boat trip”（乘船旅行）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“enjoy”的现在分词为“enjoying”（“enjoy the scenery”表示“欣赏风景”，单元核心短语）。
teaches; is teaching解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“my mother”是单数第三人称，“teach”变“teaches”；第二空“now”提示现在进行时，be动词用“is”，“teach”的现在分词为“teaching”（“teach a new lesson”表示“教新课”，单元核心语境）。
is setting解析：后句“it's getting dark”（天变黑）提示“太阳正在落下”，用现在进行时；主语“the sun”是单数，be动词用“is”，“set”的现在分词为“setting”（“set in the west”表示“在西方落下”，单元核心语境）。
are observing解析：前句“having a science experiment”（正在做科学实验）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“observe”的现在分词为“observing”（“observe the changes”表示“观察变化”，单元核心词汇）。
performs; is performing解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“she”是单数第三人称，“perform”变“performs”（“perform on stage”表示“登台表演”，单元核心短语）；第二空“now”提示现在进行时，be动词用“is”，“perform”的现在分词为“performing”。
are working解析：前句“loading the goods”（正在装货）提示当前动作，后句“very fast”（很快）描述动作状态，用现在进行时；主语“they”是复数，be动词用“are”，“work”的现在分词为“working”。
writes; is writing解析：第一空“often”（经常）表习惯性动作，一般现在时，主语“he”是单数第三人称，“write”变“writes”（“write stories for children”表示“为孩子写故事”，单元核心语境）；第二空“now”提示现在进行时，be动词用“is”，“write”的现在分词为“writing”。
are laughing; are playing解析：前句“making a snowman”（正在堆雪人）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“laugh”（笑）、“play”的现在分词分别为“laughing”“playing”（“play in the snow”表示“在雪中玩”，单元核心语境）。
are fastening解析：前句“the plane is taking off”（飞机即将起飞）提示乘客当前的动作“系安全带”，用现在进行时；主语“passengers”是复数，be动词用“are”，“fasten”的现在分词为“fastening”（“fasten seat belts”表示“系安全带”，单元核心短语）。
is exercising解析：“usually goes to the gym”（通常去健身房）与“today”（今天，在家）对比，当前动作“锻炼”正在进行，用现在进行时；主语“she”是单数第三人称，be动词用“is”，“exercise”的现在分词为“exercising”。
are listening解析：前句“giving a lecture”（正在讲课）提示学生当前动作“认真听”，用现在进行时；主语“the students”是复数，be动词用“are”，“listen”的现在分词为“listening”（“listen attentively”表示“认真听”，单元核心语境）。
are busy解析：前句“harvesting the crops”（正在收割庄稼）提示农民当前状态“忙碌”，用一般现在时表当前状态；主语“they”是复数，be动词用“are”，“busy”（忙碌的）为单元核心形容词。
always sleeps解析：“always”（总是）表习惯性动作，用一般现在时；主语“she”是单数第三人称，“sleep”变“sleeps”（“sleep with the light on”表示“开着灯睡”，单元核心语境）。
sees解析：前句“the dog is barking”（狗在叫）推测原因“似乎看到奇怪的东西”，用一般现在时表当前情况；主语“it”是单数，“see”用原形。
are cooking; are chatting解析：前句“having a barbecue”（正在烧烤）提示当前动作，用现在进行时；主语“they”是复数，be动词用“are”，“cook”（做饭）、“chat”（聊天）的现在分词分别为“cooking”“chatting”。
is using解析：前句“drawing a picture”（正在画画）提示当前动作“用不同颜色”，用现在进行时；主语“he”是单数第三人称，be动词用“is”，“use”的现在分词为“using”。
are looking out解析：前句“the train is moving”（火车在行驶）提示乘客当前动作“看向窗外”，用现在进行时；主语“the passengers”是复数，be动词用“are”，“look out”（向外看）为单元核心短语，现在分词为“looking out”。
