does和doesn't和did和didn't分别怎么用?用于什么?

does和doesn't和did和didn't分别怎么用?用于什么?
does和doesn't和did和didn't分别怎么用?用于什么?

does和doesn't和did和didn't分别怎么用?用于什么?
does doesn't 用于第三人称一般现在时的肯定和否定句.did didn't 用于所有人称一般过去式的肯定和否定句