时态的标志性词语答:一般过去时:ago,yesterday,last,just now等短语 现在进行时:now,at this moment,these days,at present,right now,at this moment 现在完成时:already,yet,now,just,by this time,today,this morning,this week,recently,lately,since then,often,(ever)since,before,ever 过去完成时很多都是短语 ...