(1)表示说话时正在进行的动作或存在的状态。
Our friends are waiting for us outside now.
(2)表示现阶段正在进行的动作或发生的事情。
She is learning English at college.
(3)某些短暂性动词,如come,go,start,open,close,arrive,return,begin,leave等用于进行时,表示按计划、安排即将发生的动作。 My father is coming to see me this Saturday. He is leaving for Beijing next week. (4)某些动词的进行时表示慢慢地、渐渐地发生变化。 I'm forgetting English. She is losing her eyesight. 3.现在完成时
(1)表示过去的动作对现在的影响或结果,常用recently,lately,ever,never,once,before,yet,just等作时间状语。
He hasn't heard any news from his son lately.
Have you ever been to London?
(2)表示开始于过去某一时刻,一直持续到现在而且还有可能继续下去的动作。常用so far,up till now,since,for a long time,in the past/last few years,these days等作时间状语。
So far no life has been found outside the earth.
He has learned 5,000 English words since he went to college.
(3)“This/It is+the+序数词+time+that...”句式中,that后的从句用现在完成时。
This is the second time that I have visited the university.
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