do did does 怎么用？

do 一二人称( I, you)， 还有复数(they)现在式
for example)
I do.
we do
You do.
They Do.

did 所有人称过去式
for example)
i did.
we did
you did.
they did.
he did.
she did.

does 第三人称(he, she) 现在式
for example)
she does.
he does.

done 所有人称过去分词
for example)
i have done
we have done
you have done
she has done
he has done
they have done

i can speak english, i gave you simple examples because i didn't want to complicate you.....=)

do用于一般时,除了第一人称单数,其它的都用do
did用于过去时.did是do的过去式.
does用于一般时,用于第一人称单数.

第一人称单数有:
he,she,it

要看时态
如果是过去式用did
一般现在时用do
does是在一般现在时并且主语是单数如he
she
it之类的情况下用
你这句话在不确定时态时就是一般现在时
就是Do
you
hear
that？
有助动词帮忙动词用原形应该是hear，heard是他的过去式