情态动词、系动词、助动词的一般用法

情态动词

will, must, need, can, could, may, might, shall, should

示例:will

He will finish his homework. / will do something
He will not finish his homework. / will not do something
Will he finish his homework? / will somebody do something
His homework will be finished. / something will be done

示例:may

He may finish his homework.
He may not finish his homework.
May he finish his homework?
His homework may be finished.

系动词

be (is, am, are)

示例:is

She is a student.
She is not a student.
Is she a student?

示例:are

They are teachers.
They are not teachers.
Are they teachers?

助动词

do (does, did)

示例:does

She likes football.
She does not like football.
Does she like football?
Football is liked by her.

示例:did

Tom liked reading.
Tom did not like reading.
Did Tom like reading?
Reading was liked by Tom.

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