呃``` 现在完成时的标志词...

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 years)
.
够全了吧,我就是教师.

have（has)+动词的现在分词形式

already,yet,before