1.一般现在时:主语+do/does(现在分词)

　　e.gWecleantheroomeveryday.

　　2.一般过去时:主语+did

　　e.gWecleanedtheroomjustnow.

　　3.现在进行时:主语+am/is/aredoing

　　e.gWearecleaningtheroomnow.

　　4.过去进行时:was/weredoing

　　e.gWewerecheaningtheroomat5:00yesterdayafternoon.

　　e.g5.现在完成时:have/hasdone

　　Wehavecleanedtheroomalready.

　　6.过去完成时:haddone

　　e.gWehadcleanedtheroombeforehearrived.

　　7.一般将来时:willdo/

　　e.gWewillcleantheroomtomorrow.

　　8.过去将来时:was/wereto/woulddo

　　e.gHesaidhewouldcleantheroomnext.