一、Need 作情态动词

后面不带to，表示必要，仅用於否定句及疑问句, 或用於if及whether之後或与hardly﹑ scarcely﹑ no one等连用：

You needn’t finish that work today.

你今天不必把那项工作做完.

`Need you go yet?’ `No, I needn’t.’

‘你一定得去吗?’‘我不必去.’

He wondered whether they need send a deposit.

他不知道他们是否得交定金.

If she wants anything, she need only ask. 她想要什麽, 只需说一声就行.

I need hardly tell you hat the work is dangerous.

无须我说你也知道那工作有危险.

Nobody need be afraid of catching the disease.

谁都不用害怕能得这种病.

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二、Need 作实义动词

后面要带to，表示需要

I didn’t need to go out but I wanted a breath of fresh air.

我不一定要出去, 只想吸些新鲜空气.

A dog needs to be taken out for a walk every day.

狗得每天带出去蹓.

Will we need to show our passports?

我们要出示护照吗?