新概念英语二lesson6（新概念英语二Lesson89A）

新概念英语二lesson6（新概念英语二Lesson89A）Jennifer will have to take part in a new play soon.表示肯定的推测一般译为“必须”，可以表示“必要”、“命令或强制”。没有时态和人称变化。通常只用于现在时和将来时。在其他时态中，must有时和have to或have got to可以互换。用于第一人称时，have to和have got to强调客观的要求或外在的原因，must则强调主观的要求或表示说话的人认为自己有权做某事must还表示肯定的推测She must be at least thirty-five years old.

让我们继续积累！

本课复习：情态动词的用法

新二Lesson 17

情态助动词must的用法

一般译为“必须”，可以表示“必要”、“命令或强制”。没有时态和人称变化。通常只用于现在时和将来时。在其他时态中，must有时和have to或have got to可以互换。用于第一人称时，have to和have got to强调客观的要求或外在的原因，must则强调主观的要求或表示说话的人认为自己有权做某事

must还表示肯定的推测

She must be at least thirty-five years old.

表示肯定的推测

Jennifer will have to take part in a new play soon.

客观原因，将要参加一个新演出

In the play she must appear in a bright red dress and long black stockings. Last year in another play she had to wear short socks and a bright orange-coloured dress.

must和have to的互换

新二Lesson 41

在表达“必要”、“不必要”等含义时，除了可用must和 have（got）to以外，还可以用need。need只有情态助动词的部分特征，仅用于某些疑问句和否定句。need用于疑问句时，问者往往希望得到 否定的回答

‘You needn't be so rude about it ' my wife answered as she looked at herself in the mirror.

as引导时间状语从句本句。本句的need是个情态动词，只能用于否定和疑问句。肯定句用must have to ought to或should

‘We mustn't buy things we don't need 'I remarked suddenly.I regretted saying it almost at once.

mustn't表示绝对禁止。在说话人看来，根本没有选择余地。这么说话未免太粗暴，所以后边的句子说马上后悔这么说话。

‘You needn't have said that ' my wife answered.

needn't have done表示本来不该做某事，但是已经做了 常用的类似词would should动能这么用

新二Lesson 65

He should have known that the police would never allow this sort of thing.

新概念三Lesson 11

You should have declared that

你本该申报的。实际没有。都是一种虚拟

新概念三Lesson 58

At least sorting out the things she should have discarded years ago was now being made easier for her.

在很多年前她本该扔掉的那些东西

新二Lesson 65

表示“应该”和“必须”的情态助动词 should ought have to 与must

should和ought to都可译为“应该”，表示义务、责任或某个正确的行为。

ought to比should语气略强些，多用于肯定句

疑问句与否定结构则多用should。

与它们相比，must和 have to 的语气要强得多，没有选择余地

A policeman approached Jimmy and told him he ought to have gone along a side street as Jumbo was holding up the traffic.

本应该实际上没有。as原因状语从句

so it was fortunate that we didn't have to carry him.

have to的否定形式，不必

本课

标题A slip of the tongue，舌头的一滑，口误When the news got round that a comedy show would be presented at our local cinema by the P. and U. Bird Seed Company we all rushed to see it.

嚯，好长的句子！when引导的时间状语从句。在从句中，that引导的同位语从句

We had to queue for hours to get in and there must have been several hundred people present just before the show began.

had to过去时，不得不。must have been表示对过去肯定的推测。在演出开始前，场内肯定已经有好几百人了

Those who failed to get in need not have felt disappointed as many of the artistes who should have appeared did not come.

need not have felt没有必要感到失望

should have appeared did not come.那些本该出现的艺术家都没来