复制粘贴的不要给他分!to do在做状语的时候表示目的.to wake up early next morning,he set the alarm.To do 的被动形式是to be done.完成形式是to have done,进行形式是to be doing.比如he seems to have finished ...我说的这些都算是基础的了，应该没什么口诀的吧