when we had the school leavers’ party一般过去时,陈述语序;when did we have the school leavers’ party一般过去时,疑问语序;when will we have the school leavers’ party一般将...
因此,在某些句子中,即使没有明确的过去时间状语,同学们也要能够辨别出应该用过去时态。比如“I didn't know David(was)in London.”,这句话意思是说话之前的“过去”我不知道大卫在伦敦...
when是必然发生(will happen);if是可能发生(might happen) 例句: I'll take care of it when I am free this afternoon. (今天下午我有时间,我会处理。)→一定有时间 I'll take care of...
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