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)
希望能解决您的问题.
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)
希望能解决您的问题.