用短语“clean the room”表达出英语八种时态：
1.一般现在时:主语+do/does （标志词:often,usually,every day,on Sundays, ...）
例:We clean the room every day. 我们每天打扫房间。
He cleans the room every day.他每天打扫房间。
2.一般过去时: 主语+did （标志词: just now,yesterday,last night,last week,...）
例:We cleaned the room just now. 刚才我们打扫了房间。
3.现在进行时: am/is/are doing （标志词:look,listen,now,at the moment,...）
例:We are cleaning the room now. 现在我们正在打扫房间。
4.一般将来时: will do/be going to （标志词:tomorrow,next day,next week, ...）
例:We will clean the room tomorrow. 明天我们将打扫房间。
We are going to clean the room tomorro. 明天我们打算打扫房间。
5.过去进行时: was/were doing （标志词:at that time, at this time yesterday, ...）
例:We were cleaning the room at that time. 在那时我们正在打扫房间。
6.现在完成时: have/has done （标志词:already,yet,recently,so far,ever,never,for+时间段,since+时间点, ...）
例:We have already cleaned the room. 我们已经打扫了房间。
7.过去完成时: had done （标志词:by the end of last year, ...）
例:We had cleaned the room before he arrived. 在他到达以前我们已经打扫完了房间。
8.过去将来时: would do （标志词:the next day, ...）
例:He said he would clean the room the next day.他说第二天他会打扫房间。
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