呃``` 现在完成时的标志词...英语中,现在完成时的标志词有那些..不对..老师说有12个..

have（has)+动词的现在分词形式

already,yet,before

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,so far,as yet,lately ,recently,these days/weeks/years,until now,up to now,since+ 时间点,for+时间段,always,in the last/past( few ye...