現在進行時: 主語+am/is/are doing

　　e.g We are cleaning the room now.

　　過去進行時: was/were doing

　　e.g We were cheaning the room at 5:00 yesterday afternoon.

　　現在完成時: have/has done

　　We have cleaned the room already.

　　過去完成時: had done

　　e.g We had cleaned the room before he arrived.

　　一般將來時: will do/

　　e.g We will clean the room tomorrow.

　　過去將來時: was/were to /would do

　　e.g He said he would clean the room next.