? [析] 在描述过去某一具体时刻的动作或从某时到某时一段时间内正在进行的动作要用过去进行时,如:I was washing clothes from eight till noon last Sunday?
? [误] My classmates came to see a film yesterday. I didn't go with them, because I have seen it before.
? [正] My classmates came to see a film yesterday. I didn't go with them because I had seen it before.
? [析] 现在完成时与过去完成时的相同之处是其动作均开始于过去的某一点,它的差别在于该动作是截止到什么时候。如动作截止到现在用现在完成时;如动作截止到过去,用过去完成时。例如:I've learnt English for three years.(到现在为止)又如:Before I went to college, I had learnt English for three years. (动作截止到上大学那时,即截止于过去)
? [误] I'm feeling well now.
? [正] I feel well now.
? [析] 瞬间动词有些无进行时态,它们是:?表示思维状态的词:believe, feel, forget, imagine, know, mean, need, prefer, remember, understand, want? 表示感情的动词:care, like, do like, love, mind, hate, fear? 表示状态的词:belong, own? 感观动词: feel, hear, see, smell, taste
? [误] When have you done this work?
? [正] When did you do this work?
? [析] when提问的是一个时间点不可用于完成时态的问句中。
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