英语是现在世界上用的最多的一门语言，许多国家都在学英语和用英语，所以，学好了英语，出门就不怕沟通不方便了。接下来，和小编一起来了解三年级英语期末语法知识点。

(一)情态动词can

can 在英语中有一个特殊的名字,叫做情态动词，表示“能够”, “会”, “能力”后面要跟着表示动作的动词。没有时态和人称的变化。表示不能做什么的时候,后面加上 not为 can not,或者缩写为can’t。问别人“能…吗？”要把can 放在句子前面,首字母要大写,句尾别忘加上问号。

例句：—I can swing .I can draw.

　—She can jump.He can play .

　—We can touch .They can run.

　—I can’t sing.You can’t see.

　—She can’t dance.He can’t hear a car.

　—We can’t hear an aeroplane.

　—Can you hear a dog？Can he hear a bus？

　—Can Lucy write？Can you do it?

将下面各组词组成句子

1.________________________（an,aeroplane,hear,Lucy,can ）

2. ____________________________ (not,he ,dance,can )

3.____________________________? (you,can ,see,what )

4.____________________________(can ,see ,not ,we ,you)

5._____________________________. (I ,can ,help ,you )

6._____________________________? (I,can ,do,what)

7._____________________________? (you ,can ,hear me)

8._____________________________? (you ,can ,dance)  

答案：1. Lucy can hear an aeroplane.   2. He can not /can’t dance.   

3. What can you see?                 4. We can not /can’t see you  

5. I can help you.                    6. What can I do?

7. Can you hear me?                  8. Can you dance?

二. 祈使句：表示请求、命令、建议或劝告等的句子叫祈使句，主语you常省略。
1、肯定形式：一般以动词原形开头。 Open the door, please. 
2、否定形式：在句首谓语动词前加Don't。 Don't be late for class.   

三 特殊疑问句（又叫wh-question）

　用特殊疑问词来提出问题的疑问句叫作特殊疑问句。特殊疑问词一般要放在句首。常用的疑问词有what who，which how 等这些词都以wh 开头（包括how）所以也叫作wh-question。特殊疑问句要求回答具体内容。不能用yes或no回答。结构：疑问词+一般疑问句。回答不能用yes / no(或相当于yes / no)回答的问句。答句的句式同肯定句句式：如：

What can you see ?　I can see a cat.

What can you hear ?　I can hear a bus.

What can you do ?　I can sing and dance.

What is it ?　 It’s a panda.

What do you like ?　I like playing football

How old are you ?　I’m ten.

一.将下列句子变成一般疑问句

1 Mr Wang is thirsty　__________________________?

2.The elephent’s ears are long　__________________________?

3. We like birds　_________________________?

4.Hello.You are his mother　__________________________?

5.I can sing and dance.　___________________________?

二 将下列每组词各组成一句特殊疑问句

1.(you are how). _________________________?.

2.(old how Ben is)_________________________?

3.colour is what your shirt_________________________?

4.(can see what the on you desk ) ________________________?

5.(like what do you)_________________________?  

答案：一.1. Is Mr Wang thirsty?　2. Are the elephent’s ears long　3. Do you like birds?　4.Hello. Are you his mother?　5.Can you sing and dance?

二.1. How are you?　2.How old is Ben ?　3.What colour is your shirt?　4.What can you see on the desk?　5.What do you like?

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