need既可做实义动作，又可作情态动词，下面是2017高考英语语法情态动词用法总结：need，精品学习网希望对大家有帮助。

1. need作情态动词主要用于疑问句、否定句，否定式为needn't. 没有过去式形式，表达过去意义时仍用need。

Need you go soon?  We needn't hurry.     Need I come? No, you needn't (don't have to)/Yes, you must.  注意

need问句的肯定回答用must，否定回答用needn't或don't have to.

2.用在有否定意思的句子中。(带有no, hardly等否定词的句子)。 I hardly need say how much I missed you.

3. need作实义动词有人称、数、时态的变化。肯定式：need to do。否定式：don't need to do。 注意

need doing = need to be done   Does he need to know it? The windows need cleaning.

4. needn't have done表示“本不必做…(却做了)”。   I needn't have bought the book.   You needn't have told them about it.

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2017高考英语语法情态动词用法总结：would 

2017高考英语语法情态动词用法总结：will