课件19张PPT。Unit 4
Then and nowLet's try & Let's talkPart BLearning goals能够在图片和教师的帮助下理解对话大意，并回答读后题。
能够按照正确的语音、语调及意群朗读对话，并能进行角色表演。
能够听、说、读、写，并在情景中运用句型 Before, I was… Now, I’m … 对比过去和现在自己的变化。
能够描述自己朋友或家人的变化。Let’s tryMike's friends are visiting his home.
Listen and circle. 1. What are they talking about?
Mike's hobby. B. Mike's old photos.
2. What grade was Mike in?
A. Grade 1. B. Grade 5.Let’s talkChen Jie: John, come and look at Mike's old photos!
John: That's funny, Mike! You're wearing a pink T-shirt.
Mike: Yes, but I don't like pink now.
Chen Jie: We are all different now!
Mike: Right. Before, I was quiet. Now, I'm very
active in class. How about you?
John: Well, I was short, so I couldn't ride my
bike well. Now, I go cycling every day. I like it very much.
Chen Jie: That's good exercise.
How did Mike change? Check answersQ: How did Mike change?
A: Before he liked pink, but now he doesn't like pink. Before, he was quiet, but now he is very active in class. 课文呈现1：You're wearing a pink T-shirt.
你穿了一件粉色T恤。 wear：①穿衣服，穿鞋子 ②戴眼镜，戴帽子③留头发，留胡子
put on：穿上，侧重于穿好后的状态。课文解读课文呈现2：Well, I was short, so I couldn‘t ride my bike well. 嗯，过去我很矮，所以我不能很好地骑自行车。well:
第一个well意为“唔，嗯”等，表示惊奇、犹豫、同意等。
第二个well为副词，意为“好；很好；顺利地”等。简介祈使句
祈使句表示请求、命令、叮嘱、邀请、劝告等。祈使句分为第二人称祈使句及第一、三人称祈使句两大类。（1）第二人称祈使句通常用来向听话者发出命令、提出要求或建议。这种祈使句的主语you通常不表示出来，而是以动词原形开头。句型为“实义动词+其他成分.”或“Be+表语.”。例如：
Stand up！起立！ Be careful！小心！
Come in，everybody！每个人都进来！（2）第一、三人称祈使句是以第一人称和第三人称代词或者名词等作为祈使的对象，这类祈使句通常以let为引导词表示建议。句型为“Let+宾语+动词原形+其他成分.” 。例如：
Let us go home！让我们回家吧！
Let him be here by 10 o’clock. 他必须在10点前到这里。【知识拓展】祈使句除用谓语动词表示外，还可用名词、副词、动词短语等表示。例如：
Help！救命！ Patience！要忍耐！
Quickly！快！ Hands up！举起手来！ all的用法
在这里all用作代词，意为“全部，全体，大家，整个”。它既可以指代单数名词，又可以指代复数名词，在句中可以做主语、宾语、同位语。例如：
All（=Everything）is ready. 一切都准备好了。（作主语）
I know all of them.他们我全都认识。（作宾语）
They are all working hard.他们都在努力工作。
（作同位语）【注意】
all用作同位语时要放在be动词、助动词之后，实义动词之前。例如：
We are all students. 我们都是学生。
We all want to help her. 我们都想帮助她。
all用作定语时要放在定冠词the，指示代词this，that，these，those或形容词性物主代词之前。例如：
【误】His all friends are coming this evening.
【正】All his friends are coming this evening.before的用法
before在这里为副词，表示“（时间）以前，早些时候，过去”。例如：
She was short before. 从前她很矮。
before用作介词，表示“（时间）早于，先于”。例如：
The darkest hour is before the dawn.
最黑暗的时间过了就是黎明。before用作介词，表示“（顺序，排列）在前，优于”。例如：
You’ll have your turn before me. 你将比我先轮到。
before还可用作连词，意为“在……前；不久……就”。例如：
I hadn’t waited long before the train arrived. 我等了 不久火车就来了。Role-playTalk about your friends or family members.
How did they change?wasn’t tall/…
had long/… hair
didn’t wear glasses/…didn’t like maths/…
didn’t like cats/…
didn’t like eggs/…Exercise一、选词填空。different quiet active cycling exercise1.You should do more _______.
2. We will go _______.
3. I have a _______ answer.
4. Alice is _______. She likes reading.
5. Mike is _______. He likes sports.Homework Review what we have learned in this class, including the new words and the main sentence patterns.
