一、完成时态 have + done(过去分词)
4中失态
I have done my homework by now. //现在完成时
I had done my homework by last week. //过去完成时
I will have done my homework by next work. //将来完成时
Yesterday I said I would have done my homework by next week. //过去将来完成时
现在完成时态
1、过去发生的动作对现在影响或结果。常用already、just
I have already bought a car. //alread
2、过去发生的动作一直持续到现在。 常用for、since
I have studied English for ten years.
二、
haha