英语专业四级语法专题
情态动词
I. “needn’t+完成时态”结构didn’t need + 不定式普通式:动作还未发生needn’t + 不定式完成式:动作已经发生You _____ Jim anything about it. It was none of his business.A. needn’t have told B. needn’t tellC. mustn’t have told D. mustn’t tell
表示推测——情态动词主要使用方法.
必定推测可能推测否定推测疑问推测
must/should
对未来 对现在 对过去
情态动词
may, might
can’t, couldn’t
can, could
~ + V ~ + V ~ + have done/常见must be must be doing have been doing
~ + V. ~ + V. ~ + have done + be doing /h ...


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