現(xiàn)在完成時屬于現(xiàn)在時范圍,故不能和過去的時間狀語連用。如:yesterday,last Sunday,in1990,three years ago等。但是,在強調(diào)動作產(chǎn)生的后果和影響時,可以和一些表示不確定的時間狀語連用。
  a. 用副詞already和yet。already一般用于肯定句中,yet一般用于否定句和 疑問句中。如:We have already finished our homework.我們已完成作業(yè)了。
  They haven't finished their homework yet.他們還沒有完成作業(yè)。
  b.用ever 和never。多用于否定或疑問句中,表示“曾經(jīng)”或“從未“等。 如:-Have you ever been to the Great Wall?你曾經(jīng)去過長城嗎?
  -I have never been to the Great Wall.我從未去過長城。
  c.用表示到說話為止的過去時間狀語,如just,before,up to now,the past few years等。例如:I have seen her before,but I can not remember where.
  我以前見過她,但記不起在哪里見過。
  He has been there three times the last few days.
  近幾年他去過那里三次了。
  d.用包括“現(xiàn)在”在內(nèi)的時間狀語,如:now,today,this morning(month,year,term)等。例如:-Have you met him today?-No,I haven't.
  今天你見過他嗎?我 沒有。
  How many times have you been there this year?
  今年你去過那里多少次?