1.一般现在时: 主语+do/does(现在分词)
We clean the room every day.
2.一般过去时: 主语+did
We cleaned the room just now.
3.现在进行时: 主语+am/is/are doing
We are cleaning the room now.
4.过去进行时: was/were doing
We were cheaning the room at 5:00 yesterday afternoon.
5.现在完成时: have/has done
We have cleaned the room already.
6.过去完成时: had done
We had cleaned the room before he arrived.
7.一般将来时: will do/
We will clean the room tomorrow.
8.过去将来时: was/were to /would do
He said he would clean the room next.
参考资料:http://ks.cn.yahoo.com/question/1307091603553.html