When, while, before, after, till, once, as soon as, so long as, by the time, if, in case (that), unless, even if, whether, the moment, the minute, the day, the year, immediately等引导的时间状语从句,条件句中,用一般现在时代替将来时。例如:
He is going to visit her aunt the day he arrives in Beijing. 他一到北京,就去看他姨妈。
16. 一般现在时代替一般过去时
1 ) "书上说","报纸上说"等。例如:
The newspaper says that it's going to be cold tomorrow. 报纸上说明天会很冷的。
2) 叙述往事,使其生动。例如:
Napoleon's army now advances and the great battle begins.拿破仑的军队正在向前挺进,大战开始了
17. 一般现在时代替现在完成时
1) 有些动词用一般现在时代替完成时,如hear, tell, learn, write , understand, forget, know, find , say, remember等。例如:
I hear (= have heard) he will go to London. 我听说了他将去伦敦。
I forget (=have forgotten) how old he is. 我忘了他多大了。
2) 用句型 " It is … since…"代替"It has been … since …"。例如:
It is (= has been) five years since we last met. 从我们上次见面以来,五年过去了。
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