一课一题一语法：新概念英语第2册第41课
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下面我们继续本周《新概念英语2》第41课的重点句型或语法的分享。先来读一读课文：
一、课文原文
Lesson 41 Do you call that a hat?
'Do you call that a hat?' I said to my wife. 'You needn't be so rude about it,' my wife answered as she looked at herself in the mirror. I sat down on one of those modern chairs with holes in it and waited. We had been in the hat shop for half an hour and my wife was still in front of the mirror. ‘We mustn't buy things we don't need,' I remarked suddenly. I regretted saying it almost at once. 'You needn't have said that,' my wife answered.' I need not remind you of that terrible tie you bought yesterday.' 'I find it beautiful,' I said. 'A man can never have too many ties.' 'And a woman can't have too many hats,' she answered. Ten minutes later we walked out of the shop together. My wife was wearing a hat that looked like a lighthouse!
——选自《新概念英语》第二册，外语教学与研究出版社，1997年10月第1版
二、重点句型或语法
本课侧重复习情态动词must和need以及动词短语have to的用法。今天，我们就来重点看看need的用法。
need在英语里被称作半情态动词，当用作情态动词时，其用法为need do sth，否定形式为needn’t do sth 。例如：
I wonder if we need take sleeping bag.
我不知道是否需要带睡袋。
He needn’t go there tomorrow.
明天他不必去了。
need用作情态动词时没有人称、时态及语态的变化，后面直接跟动词原形构成句子的谓语，表示“必须，必要”，一般用于否定句或疑问句中。如：
We’ve got plenty of time. We needn’t hurry.
我们有足够的时间，我们不必着急。
Joe can stay here. He needn’t come with us.
乔可以留在这里，他不必和我们一起去。
当need用作实义动词时，用法为need sth.或need to do sth，此时need有动词的全部变化形式。如：
We don’t need to hurry.
我们不需要着急。
Does he need any help?
他需要帮助吗？
Tom needed to be helped over the difficulty.
汤姆需要帮助来克服困难。
下面，再来比较needn’t do和needn’t have done的用法，先看两句例句吧!
Everything will be OK. You needn’t worry.
一切都会好起来的，你不用担心。（表示没有必要）
Everything was OK. You needn’t have worried.
一切都还好，你不必担心。（表示你担心了，但没必要）
这里 needn’t have done sth. 侧重于这件事做了，但是现在知道其实没有必要。
三、一课一题
根据本课的重要语法点，让我们来练一练吧，请选择正确的选项。
I ___ have worried before I came to the new school, for my classmate here are very friendly to me.