need

1.情態(tài)動(dòng)詞need

need和dare一樣，作為情態(tài)動(dòng)詞時(shí)，主要用于否定句和疑問句，一般不用于肯定句中(在肯定句中常被must, have to, ought to, should等情態(tài)動(dòng)詞取代)。作為情態(tài)動(dòng)詞，它的詞形只有need一種形式。

You needn't return the book now. You can keep it till next week if you like.　你現(xiàn)在不必還書， 如果愿意，你可以下周還。(needn't = don't have to)

Need I hand in my homework now

我現(xiàn)在就要交家庭作業(yè)嗎?

--- Need he finish the article next week

他要下個(gè)星期完成這篇文章嗎?

--- Yes, he must.

是的，他必須完成。

--- No, he needn't.

不，他不需要。(= he doesn't have to)

2.行為動(dòng)詞need

need和dare一樣，也可以作行為動(dòng)詞，可用于肯定句、否定句和疑問句中。行為動(dòng)詞need有人稱和數(shù)的變化。

Plant needs water.

植物需要水。

My shirt needs a button.

我的襯衫需要一枚鈕扣。

My car needs repairing.

我的車該修理了。

He has grown up. We don't need to worry about him.

他已經(jīng)長(zhǎng)大了，我們不必為他擔(dān)心。

You don't need to buy so many things for the picnic.

你不必為這次野餐買這么多東西。

Patience is needed for that job.

干那工作，需要耐心。

提示：

Need作為情態(tài)動(dòng)態(tài)時(shí)，不要用于肯定句中。

【誤】She need do her homework by herself. (need作為情態(tài)動(dòng)詞時(shí)，不用于肯定句中)

【正】She needs to do her homework by herself.

她該獨(dú)立完成家庭作業(yè)。

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