沒有明顯的時間對比,無須用過去完成時.過去時就可以,表述一個事實.可是有for加時間段啊I (worked) in Shanghai for 8 years 我曾經(jīng)上海工作了8年。這只是講述一個過去的事實，我現(xiàn)在已經(jīng)不在上海工作了。 狀語（for + 時間）只是表達一段時間，無須和完成時態(tài)掛鉤，更不是和完成時態(tài)形成什么“固定結(jié)構(gòu)”過去時可以表達(1)過去的一個動作，也可以表達(2)過去一段時期重復(fù)或持續(xù)的動作情況（2）就可以加上（for + 時間）的狀語：I stayed in the hotel for two whole weeks.同樣的，未來時態(tài)也可以這么用：They will stay in the hotel for three days.We are staying in a hotel for a few days. （未來計劃/安排）其他如情態(tài)句子也可以加上同一狀語：You can stay here for a week.完成時態(tài)因為表達的是一段時間內(nèi)持續(xù)的動作，和（for + 時間）狀語正好意氣相投，所以常見到他們兩者出雙入對:We have stayed here for two weeks.但這并不表示狀語（for+時間）就非得專一不可。人會腳踏兩條船，完成時態(tài)又何嘗不會，完成時態(tài)除了表達(1)一段時間內(nèi)持續(xù)的動作，也可以表達(2)過去一個完成的動作，情況(2)就不能加上（for+時間）的狀語：錯誤：He has bought the car for two years.正確：He has had the car for two years. The car has belonged to him for two years.我的理解是這樣的，看看可不可以幫得上忙。He did not talk to his mother for many years. 他有許多年沒有跟他媽媽談話。He has not talked to his mother for many years. 他有許多年沒有跟他媽媽談話（一直到現(xiàn)在也沒有）He has not been talking to his mother for many years. 他有許多年沒有跟他媽媽談話（一直到現(xiàn)在也沒有，而且仍然會這樣）所以關(guān)鍵不在 for（many）years，而是在于你想表達的意思，然后選擇用什么時態(tài)。