一.情態(tài)動詞need:need只有在疑問句和否定句中可用作情態(tài)動詞,表示“需要”:
Need we answer this letter?
這封信我們需要回嗎?
So I needn't tell him,need I?
所以我無需告訴他,對吧?
We needn't worry.
我們無需發(fā)愁。
You needn't have mentioned it.
這事你是不必提到的。
—Need I come?
一Yes,you must?
—我需要來嗎?
一你一定要來。
need也可用作及物動詞,這時可和不定式連用,可用于肯定句、疑問句和否定句:
We need to make preparations.
我們需要作準備。
Does she need to be notified?
需要通知她嗎?
You don't need to do it yourself.
這事你不必親自去做。
二.情態(tài)動詞dare:dare只在極少數(shù)情況下用作情態(tài)動詞,主要用在疑問句、否定句及條件從句中,表示“敢”:
Dare you go home alone?
你敢一個人回家嗎?
She daren't even look at me.
她甚至不敢看我。
How dared they do such a thing?
他們怎么敢干這樣的事?
No one dared speak of it.
沒人敢談起這件事。
I won't allow you to do it even if you dare do it.
就是你敢做我也不讓你這樣做。
在多數(shù)情況下dare都用作及物動詞,和帶to的不定式一起用:
We must dare to act.
我們要敢干。
The girl did not dare to go home alone.
這姑娘不敢一個人回家。
No one dared to suspect him.
沒人敢懷疑是他。
Who dares to jump over the stream?
誰敢跳過小溪?