现在完成时的标志词是什么?答:2、yet 放在否定句和一般疑问句句末。其他的标志词:just, before, recently,still, lately, never, ever, twice, on several occasions, in the past/last few days/weeks/months/years, (up to)these few days/weeks/months/years,this morning/week/month/year。3、before 表示之前发生的事情,...
现在完成时的时间标志答:现在完成时的构成是have和has+v现在分词构成.标志词一般有already,yet,sofar,asyet,lately,recently,thesedays/weeks/years,untilnow,uptonow,since+时间点,for+时间段,always,inthelast/past(fewyears)