2016年00015英语(二)复习资料-串讲笔记第二部分:系动词19

山西万博体育app官网网 发布时间:2015年11月26日

31.need作情态动词时,主要用于否定句和疑问句,表示“没有必要……”或“有必要……吗?”

    You needn’t come all the way just to see the film.

    Need we accompany our aging parents wherever they go?

(1)needn’t have + ed分词表示虽然已完成但却是没必要的行为。

    You needn’t have paid the admission fee,for the lecture was free for members of the club.

    He needn’t have bought such a large TV set.His children would have been quite happy with a smaller one.

(2)needn’t have + ed分词与didn’t need to do sth.的区别:后者表示“不一定非干某事,而通常也并没有这样做”。

    I needn’t have bought the cheese,for there is plenty at home.

    (我本来是根本没必要买奶酪的,家里还有很多。)

    I didn’t need to buy any cheese,for in my home no one enjoys it.

    (我不用买奶酪,因为家里没人爱吃。)

     注意:在didn’t need to结构中,need不是情态动词而是实义动词。