do，did，does和done的用法：
一：do是动词原形，did是过去式，does是第三人称单数形式。都可以用作实义动词，都可以单独作谓语也可用作助动词。
done是实义动词，不能用作助动词。done是非谓语动词形式，不能单独作谓语。
二：用于一般现在时和各种将来时态中。
只用于一般现在时且主语是第三人称单数形式的句子中。
用于各种完成时态和各种被动语态中。
例句：
1、I do some cleaning every day.
2、Tom often does his homework after supper.
3、Mary did her homework at school yestetday.
4、I have done my homework.
5、Tom's homework has been done already.
