能否详细的把现在完成时用法写一遍,越具体愈好答:10.不可以与一般过去时的定义混淆 标志 already, yet, just, before, recently,still, lately,never,ever, never, twice, on several occasion,in the pastfew days/weeks/months/years,up to,these few days/weeks/months/years,this morning/week/month/year, just, up to present, so far,up...