一、现在完成时 标志词：just、already、yet，ever, never , recently , for , since , before ,still now , so far , 比较 have been to 表示去过，已经回来了。 have gone to 表示去了，还没有回来。Have been in 表示一直在某个地方 1) I have been to Beijing twice.我去过北京二次。 2) He has gone to Beijing , and he will be back next week. 3) I have been in Beijing for three years. He has been a soldier for three years.他参军三年了。 His father has been dead for two years.他父亲去世二年了。 The film has been on for ten minutes.电影已开
