专业四级语法 | 情态动词的基本用法考点归纳

情态动词后要接实义动词或者系动词的原形;情态动词的时态比较单一,大部分情态动词只有现在时和过去时两种时态, must 则只有现在时。

常见的情态动词包括:can, must, may, shall, will, dare, need, ought to 等。其基本用法主要考点包括:

1. must意为“必须”,而 mustn't 意为“禁止”。 must 对应的否定含义“不必”的表现形式有很多种:needn't, don't need to, do not have to 等。

2. need 和 dare 只有在否定句和疑问句中才能作情态动词,且也可以作实义动词;在肯定句中, dare 和 need 则只能作实义动词,后面跟动词不定式。比如:

  • You needn't do that.
  • You don't need to do that.
  • He needs to work 10 hours every day to support the family.