1)be going to +v 在口语中广泛使用,表示准备做或将发生的事情。例如: Im going to buy a house when weve saved enough money. 2)be to +v 表示计划安排要做的事,具有必要的强制性意义。例如: I am to play ten...
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时间状语从句,条件句中,从句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, t...