. Need(需要) 的用法 1.Need作为实义动词 有人称、数和时态的变化〔在变为否认句和疑问句时需借助于助动词〕 (1)当主语是人时,后可接名词和动词不定式, 即:need sth./ need to do sth. Eg: He needs some help. It's cold outside. You need to wear more clothes. Need后跟不定式且用于否认句中时,表示“不必〞,指没义务或没必要做某事。 Eg: You don't need to do it at once.你不必马上做那件事情。 (2)当主语为物时,后接名词或v-ing. Eg: The flowers need water. 这些花需要水。 The flowers need watering.这些花需要浇水。 2.need作为情态动词 〔注:情态动词不能独立作谓语,必须和动词原形一起构成谓语,即need作为情态动词时,后面必须跟动词原形〕 无人称、数和时态的变化,常用于否认句和疑问句中。 Eg: You needn't go this week.这周你不必去。 .精品. . 由need引导的一般疑问句,肯定答复一般用must, 否认答复一般用needn't。 Eg: -------Need I come? -------Yes, you must./ No, you needn't 注:由must引导的一般疑问句,肯定答复一般用must, 否认答复一般用needn't或 don't have to Eg: --------- Must I go now? -------- Yes, you must. No, you needn't/don't have to. .精品. 本文来源:https://www.wddqw.com/doc/55551f472a4ac850ad02de80d4d8d15abf230029.html