現(xiàn)在完成進行時基本句型
肯定式第一人稱have been doing sth.
疑問式：Have+第一人稱+been doing sth.
簡略回答：Yes，第一人稱 have.No，第一人稱 haven't.
肯定式：第三人稱+has been doing sth.
疑問式：Has+第三人稱been doing sth.
簡略回答：Yes，第三人稱has.No，第三人稱hasn't.
1）表示一個在過去開始而在最近剛剛結(jié)束的行動，如：
Ann is very tired. She has been working hard.
Why are your clothes so dirty? What have you been doing?
2)表示一個從過去開始但仍在進行的行動，如：
It has been raining for two hours.(現(xiàn)在還在下)
Jack has been feeling very well recently.
3)表示一個從過去開始延續(xù)到現(xiàn)在，可以包括現(xiàn)在在內(nèi)的一個階段內(nèi)，重復(fù)發(fā)生的行動，如：
She has been playing tennis since she was eight.
4)現(xiàn)在完成時強調(diào)動作行為的結(jié)果、影響，而現(xiàn)在完成進行時只強調(diào)動作行為本身，如：
Tom’s hands are very dirty. He has been repairing the car.
The car is going again now. Tom has repaired it.
標(biāo)志：1.句中常有延續(xù)性動詞，2.時間點前有since。