初中英语现在完成时的用法_高中英语语法

　　mary has been ill for three days.

　　mary has been ill since three days ago.

　　注意:1.现在完成时不能单独与准确时间连用，(如表示过去的时间状语)

　　如yesterday(morning、afternoon),last(morning、afternoon)等，除非与for, since连用.

　　2.现在完成时往往同表示不确定的过去时间状语连用

　　,如already(肯定), yet(否定，疑问), just, before, recently, still, lately等:

　　he has already obtained a scholarship.

　　i haven't seen much of him recently (lately).

　　we have seen that film before.

　　have they found the missing child yet ?

　　3. 现在完成时常常与表示频度的时间状语连用,

　　如ever, never, twice, several times等:

　　have you ever been to beijing

　　i have never heard bunny say anything against her.

　　i have used this pen only three times. it is still good.

　　george has met that gentleman several times.

　　4. 现在完成时还往往可以同包括现在时间在内的时间状语连用,

　　如up to these few days/weeks/months/years, just, up to present(now), so far等:

　　peter has written six papers so far.

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