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