(2)現(xiàn)在完成時的第二個基本用法表示過去已經(jīng)開始，持續(xù)到現(xiàn)在的動作或狀態(tài)。該用法常和表示過去某一時刻延續(xù)到現(xiàn)在的一段時間的狀語連用。

①與for +一段時間連用，表示多久。

e.g. He has learned English for two years.他已經(jīng)學習兩年英語了。

I have been here for three days.我在這里已經(jīng)3天了。

②與since +時間(起點)連用，表示自…以來。

e.g. His father has worked in that factory since 1991.他爸爸自1991年以來都在這家工廠工作。

I’ve had a cold since last Friday.自上星期五起我就感冒了。

③與since +一段時間+ ago連用，表示自…以前就…。

e.g. Jim has waited there since half an hour ago.吉姆自半個小時前就已經(jīng)在那里等候了。

He has stayed here since three weeks ago.他在這兒已呆了三個星期。

④與since +從句(從句用一般過去時)連用，表示自某事發(fā)生后就一直…。

e.g.The Greens have lived in Beijng since they came to China.格林一家自從來到中國后就一直住在北京。

I’ve known her since I came to work here.自從我來這里工作就認識他了。

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