课件24张PPT。Lesson 20 Always Brush Your Teeth!Unit 4 Good Habits介词 (prep.)之时间介词时间介词（一）in/on/at
口诀巧记：
in on at 三兄弟
表示时间互不替
年月季节前用in
上下午晚也涉及
on要用来表两期
上下午晚要具体
黎夜、中午和年龄
at上岗争朝夕时间介词举例in 1988,in March, in spring
in the morning/afternoon/evening
on Monday on June 1st
on Christmas Eve on that day
on Friday morning
on the morning of June 1st
on a cold winter evening
at night/ at noon/ at dawn
at seven o’clock/ at the moment
at the age of …
时间介词（二）since,for,from
时间介词（二）举例He has worked here since 1989.
自从1989年他就在这工作了。
We’ll stay here for ten minutes.
我们将在这待10分钟。
They have studied English for 3years.
他们已经学了3年英语了。
We work for 8 hours every day.
我们每天工作8小时。
We worked for 10 hours in the past.
过去我们每天工作10小时。时间介词（二）举例They worked from 7:00 to 12:00 last year.
去年他们从早上7点工作到12点。
They work from 7:00 to 12:00 every day.
他们每天从7点工作到12点。
They will work from 7:00 to 12:00 from tomorrow.
从明天起他们将从7点工作到12点。时间介词（三）in 和 after
时间介词（三）举例He started after 3 days.
3天后他才出发的。
We’ll get there after two o’clock.
我们将在两点以后到那。
He will come back in two days.
他会在两天内回来。时间介词（四）by加时间点
by(到……为止）
+将来的时间点，时态用一般将来时
+现在的时间点，时态用现在完成时
+过去的时间点，时态用过去完成时时间介词（四）举例I will finish the work by Friday.
最晚周五我就会完成这项工作。
By now, I have eaten five cakes.
到现在为止，我已经吃了5块蛋糕了。
By the end of last year, there had been 2000 students in our school.
到去年年底的时候，我们学校已经有2000名学生了。时间介词（五）during 在……期间
后接时间段，强调时间的延续，表示在某段时间内自始至终的状态，谓语动词一般是延续性的，用于过去、将来和现在的时态。
时间介词（五）举例I woke up three times during the night.
夜里我醒了三次。
The cat likes lying on the chair during the daytime.
这只猫喜欢在白天的时候躺在椅子上。
Come and see me during the afternoon.
下午来看我吧。时间介词（六）until 直到……为止
后接时间点，也可接句子
如：He was allowed to play football until he finished his homework.
常与not连用
如：He didn’t finish his homework until 12 o’clock.
练习一：单项选择1. A terrible earthquake happened in Japan____March,2011.
A. to B. on C. in D. at
C2. A terrible earthquake happened in Japan____ the afternoon of March 11th,2011.
A. to B. on C. in D. at
B3. ----When were you born?
-----I was born____ June 2nd,1998.
A. to B. on C. in D. at
B练习一：单项选择4. ----When were you born?
----I was born___ a hot summer afternoon____1998.
A. on at B. at in
C. in on D. on in5. ----Peter, when will the lesson begin?
----We should come____ eight o’clock.
A. at B. in C. on D. to AD练习一：单项选择6. I often hear a noise____ night.
A. on B. in C. at D. byC7. We never go hiking ____winner.
A. on B. in C. at D. byB8.----What do you do ___ Mothers’Day?
----I often buy some flowers for my mum.
A. on B. in C. at D. byA练习一：单项选择9. Li Na won the tennis match in France____ June 4th,2011.
A. in B. on C. at D. forB10. My favorite film is The Sound of Music. It takes place in Australia__ 1938.
A. in B. on C. at D. forA练习一：单项选择11. I hear our teacher will be back ___ three weeks’ time.
A. at B. in C. for D. afterB12. We are going to show you the clothes____ the 1970s to the 1990s.
A. after B. in C. on D. fromD13. ----What were you doing ____ the same time yesterday?
----I was playing the piano.
A. at B. in C. on D. fromA练习一：单项选择14. ----How long may I keep it?
----____ a week.
A. On B. From C. Since D. ForD15. I have been on the school basketball team_____ 2010.
A. on B. from C. since D. forC16. ----Why do you look so tired?
----Because I didn’t go to sleep____ I finished my homework.
A. until B. from C. since D. forA练习一：单项选择17. ____ this time tomorrow, I will be in Dalian.
A. By B. From C. Since D. InA18. ----Where did you go _____ the summer vacation?
----I went to Sichuan to see the pandas. And I stayed there____ half a month.
A. on since B. from to
C. at in D. during forD练习一：单项选择19. I haven’t seen Li Yang ____a long time.
A. by B. from C. for D. inC20. ----When will Mr. Zhou come back?
----He’ll be back____3 o’clock ____this afternoon.
A. by in B. from on
C. for since D. after inD练习二：介词填空1. The film begins____ six o’clock.
2. We start school____ Monday.
3. You can’t leave here______ Tom came back.
4. I have been skating _____ nine o’clock.
5. ----How long did you skate today?
----____five hours.
6. I haven't written home _____Christmas.
7. Girls like to talk about the famous stars______ meals.
8. The accident happened ___ the morning.atonuntilsinceForsinceduringin练习二：介词填空9. I saw an old lady playing with her dog in this park____ a sunny afternoon of last week.
10. My uncle got to Guangzhou____ the morning of the 16th of April.
11. He will come to Dalian ___ two days.
12. ____ finishing cleaning the classroom, they went to do some shopping.
13. What were you doing ___ that time?
14. ___ 2020, there will be 5000 books in our library.
15. Chinese people like to eat dumplings ____ the Spring Festival Eve.ononinAfteratByon课件19张PPT。Lesson20 ExerciseNew words:exercise /`eks?saiz/ n. 锻炼
riding /`raidi?/ v. 骑 (ride的进行式)
minute /`minit/ n.分钟
hour /`au?/ n.小时 同音词our我们的Riding a bike is exercise.
骑自行车是锻炼。Walking is exercise.
步行是锻炼这是一个动名词做主语的句子。动名词是非谓语动词的一种。起名词或动词的作用。动名词做主语时，谓语用第三人称单数形式。Playing ping-pong is exercise.
打乒乓球是锻炼。Running is exercise.
跑步是锻炼。
Exercise helps make your body healthy and strong.
锻炼有助于使你的身体健康和强壮。
这句话是一般现在时，主语exercise是不可数名词、所以谓语动词用的是第三人称单数形式；短语“help do sth”。意思是“有助于/帮助做某事”,help 后面跟不定式可以省略to; make在此意思是“使”，后面跟宾语，再跟形容词做宾语的补足语。
Playing sports helps make you strong.
做运动有助于使你强壮。②How many minutes does Danny exercise? 丹尼锻炼多少分钟？1 How often do you exercise, Danny?
你多久锻炼一次丹尼？
I walk to school in the morning, and I walk home aften school.
我早上步行去学校，我放学后步行回家。
2 That's twice a day. How many minutes do you walk?
那就是一天两次。你步行多少分钟？
About five minutes.
大约五分钟。
I think you need about an hour of exercise a day, Danny!
我认为你一天大约需要一个小时的锻炼，丹尼！
Okay! I'm going to watch more sports on TV !
好的！我打算在电视上看更多的运动节目！
No, Danny ! You have to play sports for exercise!
不，丹尼！你必须靠做运动来锻炼！知识点讲解："how many minutes"意为“多少分钟”，用来对时间进行提问。
How many minutes do you +动词原形（swim, run, walk…）（+其他）
How many mintes do you run?
Five minutes.③ Let's do it !Exercise helps make our bodies healthy and strong.
锻炼有助于我们的身体健康又强壮。
I run for 20 minutes every morning.
我每天早上跑20分钟。
Ping-pong is my favourite sport. I play ping-pong three times a week.
打乒乓球是我最喜欢的运动。我一周打三次乒乓球。
That's an hour and a half a week.
那是一周一个半小时。
I play basketball twice a week. That's two hours of exercise a week.
我一周打两次篮球。那是一周两个小时的锻炼。
How man minutes do I exercise a week?
我一周锻炼多少分钟？
Sixty minutes make an hour. I walk for 30 minutes every morning. Basketball is my favourite sport.
I play basketball twice a week. That‘ 40 minutes a week.
I dance five times a week. That's 150 minutes of exercise a week.How much exercise do you need?I need twenty minutes of exercise .How many minutes do you exercise?
______ minutes.How often do you exercise?
_____ times a week.ThreeFifteenLet's chant!Ride a bike, ride a bike,
Riding is exercise.
Walk to school,walk to school
Walking is exercise.
Play ping-pong,play basketball.
Playing sports is exercise. So much for today.课件15张PPT。Unit 4 Lesson 20 Always brush your teethGet upGo to schoolGo homeGo to bedEat breakfastEat lunchEat dinnerWhen do you get up every day?I get up at_______.6:00When do you eat breakfast every day?I eat breakfast at_______.6:30When do you go to school every day?I go to school at_______.7:00When do you eat lunch every day?I eat lunch at_______.12：00When do you do morning exercises?We do morning exercises at 8 o’clock.When do you play sports?We play sports at 1:30 p.m.Goodbye!课件15张PPT。Unit 4 Lesson 20
Always brush your teethMonday TuesdayWednesday Thursday Friday Saturday SundayMonday Tuesday Wednesday Thursday FridaySaturday Sunday+=weekendWhat day is it? It’s Monday.What day is it? It’s Tuesday.What day is it? It’s Wednesday.What day is it? It’s Thursday.What day is it? It’s Friday.What day is it? It’s Saturday.Let’s play football.What day is it? It’s Sunday.It’s MondayLet’s go to school.Homework口头作业：
1.跟读课文录音三遍，家长签字。
2.再寻找一些学过的合成词和同桌说一说。。
笔头作业：
1.本课时所学四会词组抄写三遍，默写一遍。Goodbye!
