現(xiàn)在進(jìn)行時(shí): 主語(yǔ)+am/is/are doing
e.g We are cleaning the room now.
過(guò)去進(jìn)行時(shí): was/were doing
e.g We were cheaning the room at 5:00 yesterday afternoon.
現(xiàn)在完成時(shí): have/has done
We have cleaned the room already.
過(guò)去完成時(shí): had done
e.g We had cleaned the room before he arrived.
一般將來(lái)時(shí): will do/
e.g We will clean the room tomorrow.
過(guò)去將來(lái)時(shí): was/were to /would do
e.g He said he would clean the room next.