什么时候用does

第三人称单数时，用 does;当助动词用，用它来构成疑问句。这时它本身没有实义，只是一个构成疑问句的符号而已。这种用法时，它随人称和数的变化规则与上述相同，只是把它放到句首。英语是一种西日耳曼语支，最早被中世纪的英国使用，并因其广阔的殖民地而成为世界使用面积最广的语言。英国人的祖先盎格鲁部落是后来迁移到大不列颠岛地区的日耳曼部落之一，称为英格兰。

用作一般的动词，均可。do是一不规则变化的动词(do ,did,done)。

do，据人称和单复数的不同而有字形的变化。第一第二人称，以及第一、二、三人称的复数时，都用 do。

第三人称单数时，用 does( he does she does it does )

例如: I do my homework on Sunday.

You do your homework on Sunday.

We do our homework on Sunday.

You do your homework on Sunday.

They do their homeworkon Sunday.

He does his homework on Sunday.

She does her homework on Sunday.

当助动词用，用它来构成疑问句.这时它本身没有实义，只是一个构成疑问句的符号而已.这种用法时，它随人称和数的变化规则与上述相同，只是把它放到句子的最前面(句首)。例如：

Do I ...............?

Do you .............?

Do we ..............?

Do you .............?

Do they ............?

Does he ............?

Does she ...........?

Does it ............?

当助动词用，与 not 连用使句子构成否定句。其随人称和数的变化规则与上述相同。例如：

I do not ..................? (do not 可简化为 don't ,下同)

You do not ................?

We do not..................?

You do not.................?

They do not................?

He does not................? (does 可简化为 doesn't,下同)

She does not...............?