need to用法

need to用法 need 可做实义动词，又可做情态动词用。作为情态动词，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 1) 实义动词: need (需要, 要求) need + n. / to do sth 2) 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. 3) need 的被动含义:need后面接doing也可以表示被动: need doing = need to be done 一、need表示“需要”或“必须”，通常用于否定句和疑问句。例如: 1(You needn't do it again(你不需要再做了。 2(He needn't worry about it(这件事他无需担心。 3(Need he do this homework first,他需要先做这些作业吗, 4(Need they fill in the form,他们需要填表吗, 二、在否定句中，可以用need的否定形式，不定式完成体。例如: 1(We needn't have worried(其实我们不必要慌。 2(You needn't have mentioned it(你本来不必提起这件事。 3(You needn't have said that when he asked(当他问的时候，你其实不必要说。 三、needn't后的不定式间或也能用进行式或被动语态。例如: 1(He needn't be standing in the rain(他不必要站在雨中。 2(We needn't be waiting in this place(我们不必要在这儿等。 3(The hedges needn't be trimmed this week(本周树蓠不必要整修。 “need”作为实义动词时，通常用法是: 人，need ，to do 物，need ，doing 物，need ，to be done 另外，“need”后还可以直接跟名词。请看下面的例子: 1(We need to collect the parcel before we leave for England(去英国之前，我们需要收拾好行李。 2(We need to tell him the truth(我们需要告诉他真相。 3(My car needs repairing(我的汽车需要修理。 4(The flowers need watering(这些花需要浇水。 5(His leather shoes needs to be mended(他的皮鞋需要修补。 6(Her room needs cleaning(她的房间需要打扫。 7(It is a question that needs very careful consideration(这是一个需要慎重考虑的问。