一、need表示“需要”或“必須”,通常用于否定句和疑問句.例如：
1．You needn't do it again．你不需要再做了.
2．He needn't worry about it．這件事他無需擔心.
3．Need he do this homework first?他需要先做這些作業(yè)嗎?
4．Need they fill in the form?他們需要填表嗎?
二、在否定句中,可以用need的否定形式＋不定式完成體.例如：
1．We needn't have worried．其實我們不必要慌.
2．You needn't have mentioned it．你本來不必提起這件事.
3．You needn't have said that when he asked．當他問的時候,你其實不必要說.
三、needn't后的不定式間或也能用進行式或被動語態(tài).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．我們不必要在這兒等.
3．The hedges needn't be trimmed thisweek．本周樹蘺不必要整修.
“need”作為實義動詞時,通常用法是：
人＋need ＋to do
物＋need ＋doing
物＋need ＋to be done
另外,“need”后還可以直接跟名詞.請看下面的例子：
1．We need to collect the parcel before we leave for England．去英國之前,我們需要收拾好行李.
2．We need to tell him the truth．我們需要告訴他真相.
3．My car needs repairing．我的汽車需要修理.
4．The flowers need watering．這些花需要澆水.
5．His leather shoes needs to be mended．他的皮鞋需要修補.
6．Her room needs cleaning．她的房間需要打掃.
7．It is aquestion that needs very careful consideraton．這是一個需要慎重考慮的問題.