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do--does的用法

do--does的用法
do--does的用法

*助动词的用法,帮助实义动词构成否定句和疑问句。

do 这个词(does是第三人称单数形式),大体上从两方面来讲。

1.作为行为动词,跟其他动词一样,如study, play等。他的意思是“做”等。如:We usually do our homework in the afternoon.

He does his homework in the evening.

2.作为助动词,也就是帮助主要动词构成否定和疑问等。

●do用于当主语是第一人称I, 第二人称you 及复数时(复数包括we, they, these, those及两个以上的人或者事物)。

●does 用于当主语是第三人称单数时(第三人称包括she, he, it, this, that,单独的事物或者人名等)。

*含有实义动词的句型结构变换

一、肯定陈述句

1.当主语是I,you及复数时,谓语动词用原型。

Eg. I know it.

They have two volleyballs.

Tina and Tom like ice cream.

2. 当主语是第三人称单数时(第三人称包括she, he, it, this, that,单独的事物或者人名等)。谓语动词要变为第三人称单数形式。特别要注意have—has Eg. She has a set of keys.

He knows my name.

Tom needs a computer game.

二、肯定陈述句变换成否定陈述句

1.当主语是I,you及复数时,在谓语动词前加do not = don’t

Eg. I don’t know it.

They don’t have two volleyballs.

Tina and Tom don’t like ice cream.

2. 当主语是第三人称单数时,在谓语动词前加does not = doesn’t, 谓语动词打回原型

Eg. She doesn’t have a set of keys.

He doesn’t know my name.

Tom doesn’t need a computer game.

三、肯定陈述句变换成一般疑问句采用“一加二变三问号”。

一加:

●当主语是I,you及复数时,在句子开头加do;

●当主语是第三人称单数时, 在句子开头加does;

二变:

●变大小写;

●第一人称变为第二人称(I / we变为you, my / our变为your);

●当主语是第三人称单数时,谓语动词要打回原型。

三问号:在句末加问号。

肯定回答;Yes, 主语+ do/ does.

否定回答:No, 主语+don’t / doesn’t . (主语要用相应的人称代词主格)

Eg. Do you know it? Yes, I do. No, I don’t .

Do they have two volleyballs? Yes, they do. No, they don’t .

Do Tina and Tom like ice cream? Yes, they do. No, they don’t.

Does she have a set of keys?Yes, she does. No, she does n’t.

Does he know your name? Yes, he does. No, he does n’t.

Does Tom need a computer game? Yes, he does. No, he does n’t.

四、肯定陈述句变换成特殊疑问句(对画线部分提问)

特殊疑问词+ 一般疑问句?(去掉画线部分)

Eg. They have two volleyballs. ------------What do they have?

He knows my name. -------------What does he know?

练习题

把下列句子变成否定句,一般疑问句并做出肯否定回答,并对划线部分提问。

1.I know the answer.否定句:

一般疑问句:肯定回答:

否定回答:对划线部分提问:

2.We can see a boy.否定句:

一般疑问句:肯定回答:

否定回答:对划线部分提问:

3. He plays soccer every day. 否定句:

一般疑问句:

肯定回答:否定回答:

4.The books are on the teachers’ desk.否定句:

一般疑问句:肯定回答:

否定回答:对划线部分提问:

5.I like bananas.否定句:

一般疑问句:肯定回答:

否定回答:对划线部分提问:

6. Alan is a very good boy. 否定句:

一般疑问句:肯定回答:

否定回答:对划线部分提问:7. Her sweater is red. 否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:8..My pencils are in the pencil-box.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:9.I watch TV every day.否定句:

一般疑问句:肯定回答:否定回答:

10.Lily has three volleyball. 否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:11.They have five English books.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:12.You can do it now.否定句:

一般疑问句:肯定回答:否定回答:

13.Jenny needs a new bag.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:14.She likes hamburgers.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:15.My brother likes salad.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:16.My uncle watches them on TV.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:17.The computer is in my house.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:18.The ice cream is green.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:19. My father like chicken.否定句:

一般疑问句:肯定回答:否定回答:对划线部分提问:

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