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1·His phone must be switched off.

他的电话一定是关机了。《牛津词典》

2·This structure must be stable.

这种结构一定很稳固。《柯林斯英汉双解大词典》

3·These books must be very old.

这些书一定年头很久了。《柯林斯英汉双解大词典》

4·The sign must be taken down.

这个指示牌一定要摘下来。《牛津词典》

5·I really must be quite mad!

我真的一定是气坏了！《柯林斯英汉双解大词典》

6·They must be stinking rich.

他们一定富得流油。《牛津词典》

7·There must be some mistake.

一定是出了什么差错。《牛津词典》

8·You must be freezing, she said.

“你一定冻坏了吧，”她说。《柯林斯英汉双解大词典》

9·She must be sick, Tatiana thought.

她一定是病了，塔蒂亚娜心想。《柯林斯英汉双解大词典》

10·She must be very proud of herself.

她一定非常自豪。《牛津词典》

一定

1·It must be getting on for midnight.

一定快到半夜了。《牛津词典》

2·You must be freezing, she said.

“你一定冻坏了吧，”她说。《柯林斯英汉双解大词典》

3·She must be very proud of herself.

她一定非常自豪。《牛津词典》

4·These books must be very old.

这些书一定年头很久了。《柯林斯英汉双解大词典》

5·This structure must be stable.

这种结构一定很稳固。《柯林斯英汉双解大词典》