must表推测的用法must 表示很有把握的推测，其意为“一定会”“肯定会”，只用于肯定句，一般不用于否定句或疑问句。

表示对现在或未来的情况作推测，后接动词原形；表示对过去情况的推测，接动词完成式。

如：That hat must be Tom’s.

那帽子一定是汤姆的。

He must be the best violinist alive.

他一定是当代最好的小提琴手了。

There must be something wrong.

一定有什么毛病了。

The man must have a lot of money.

这个人一定有不少钱。

It must be your mother who you are thinking of.

你在想的一定是你的母亲。

Judging by the smell, the food must be good.

从香味上看，这菜一定很好吃。

I must be the happiest woman on earth!

我一定是世界上最幸福的女人了。

No, he must be lying.

不，他一定在撒谎。

He must have mistaken my meaning.

他一定误会了我的意思。

I must have slept through the alarm.

我一定是睡过闹钟定的时间了。

There must have been something blocking the pipe 管子肯定曾被什么东西堵住了。

She must have been very young when she got married.

她结婚时一定很年轻。

She said she must have slept through the alarm.

她说她一定是睡过闹钟定的时间了。

There must have been something blocking the pipe.

管子肯定曾被什么东西堵住了。

I didn't hear the phone.

I must have been asleep.

我没有听到电话铃，我一定是睡着了。

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