八年级英语上学期Unit 11语法解析

概要： I can't swim. But I am sure I will be able to swim through more practicing. The fire spread through the hotel, but everyone was able to get out When the boat sank he was able to swim to the bank 情态动词may与 might.的用法 may 的主要用法 1)表示请求、可以、允许。 You may drive the tractor. 你可以开那台拖拉机。 2)当回答由may 引起的问题时,否定答语要用must not,表示"不许可"、"不应该"、"不行"。 May I come in? Yes, you may. No,you can't No, you may not . No ,you mus

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    I can't swim. But I am sure I will be able to swim through more practicing.
    The fire spread through the hotel, but everyone was able to get out
    When the boat sank he was able to swim to the bank
    情态动词may与 might.的用法
    may 的主要用法
    1)表示请求、可以、允许。
    You may drive the tractor. 你可以开那台拖拉机。
    2)当回答由may 引起的问题时,否定答语要用must not,表示"不许可"、"不应该"、"不行"。
    May I come in?
    Yes, you may.
    No,you can't
    No, you may not .
    No ,you mustn't
    No ,you'd better not.
    3) may /might 推测性用法 可能
    He may be right.
    He may not come today  (可能不)
    He may /might come tomorrow.
    , 注意: 1只用于肯定和否定句中,不用于疑问句中。
    2 might 比may可能性更小
    He might get a job.
    He may get a job.
    3 may no 可能不  can not不可能
    He may not come
    He can't come
    3)表建议(可和as well 连用)
    You may(might)as well stay where you are.
    你还是原地待着好。(may as well 有"还是……的好"的含义)
    4)表祝愿
    May you be happy!
    might
    1)表过去的"可能"和"允许"多用于间接引语。
    She said that he might take her dictionary.
    她说他可以拿她的词典去用。
    除在间接引语中外,might一般不表示过去的"可能"与"许可"。表过去的"可能"可用could,表过去的"许可"可用were (was) allowed to。
    2)表现在的"可能",其可能性要比may小。
    Electric irons could be dangerous; they might give you a severe shock.
    电熨斗会有危险,它可能电着人。
    3)may (might) + have +done 表示对过去发生行为的推测,含有"想必"、"也许是"的意思。
    It may have been true. 这事也许是真的。
    He might not have settled the question. 他可能尚未解决那个问题。
    情态动词 must与have to 的用法
    1、must 的主要用法。
    1)表示必须、必要
    We must do everything step by step .我们必须按部就班地做一切事情。
    Why must you always bother me? 为什么你偏要打扰我呢。
    2)must be + 表语的结构,通常表示猜测,含有"一定"之意。(只用在肯定句中)
    He must be an honest boy. 他一定是个诚实的男孩。
    This must be your room. 这一定是你的房间。
    3)must 的否定式有两个:当回答由must引起的问题时,否定答复要用needn't或don't have to 表示"不必"、"无须"、"用不着"、"不一定"的意义。当表示"不应该"、"不许可"、"禁止"时,就用must not。
    Must I go tomorrow?明天我必须去吗?
    Yes, please.是的,请吧!
    No , you needn't. 不,你不必去。
    4)must +have +过去分词的结构,常用在肯定句中,表示对过去发生行为的推测,含有"一定"、"准是"的意思。否定和疑问句用can。
    She must have studied English before.她以前一定学过英语。
    2、have to的含义与must是很接近的,只是have to 比较强调客观需要,must着重说明主观看法。

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