does的用法

does可用作助动词和实义动词，还可用作连接词。作助动词时，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），第一人称I，第二人称you及复数时用do。

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。

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.

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（第三人称包括she, he, it, this, that,单独的事物或者人名等），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 doesn’t.

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

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

三、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?

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