(1)时间状语从句,条件句中,从句用一般现在时代替将来时。常用一般现在时代替将来时: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。
例句:
He is going to visit her aunt the day he arrives in Beijing.
他一到北京,就去看他姨妈。
例题:
1. He said he________me a present unless. I_______ in doing the experiment.
A. had not given; had not succeeded;B. would not give; succeed;
C. will not give; succeed;D. would not give; will succeed;
答案:B。
解析:在时间,条件或让步主语从句中一般不用将来时。本题有He said,故为过去式。主句用将来时,故选B. 此处用一般过去式代替了过去将来时。
(2) 表示现在已安排好的未来事项,行程等活动。
例句:
The museum opens at ten tomorrow.
博物馆明天10点开门。(实际上每天如此)