2019学年度人教版必修三Unit2Healthy eatingPeriod4Grammar 课件(36张)
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一、need ⑴ You needn’t/don’t have to buy that book. I can lend mine to you. ⑵ —Need I do the cleaning now? —Yes, you must. —No, you needn’t.

need既可作行为动词也可作情态动词。在情态动词时,表示 “需要”“必须”,通常用于否定句或疑问句中。用于一般疑问句时,肯定回答一般用must, 否定回答用needn’t。