need和dare这两词既可做情态动词用,又可做实义动词用。作为情态动词,两者都只能用于疑问句,否定句和条件句。 need 作实义动词时后面的不定式必须带to,而dare作实义动词用时, 后面的to 时常可以被省略。
1) 情态动词: need,只用原形need后加do,否定形式为need not。
Need you go yet?
Yes, I must. / No, I needn't.
2) 实义动词: need (需要, 要求)
need + n. / to do sth
3) need 的被动含义:need, want, require, worth(形容词)后面接doing也可以表示被动:
need doing = need to be done
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