must have

The stars must have formed 10 to 15 billion years ago.

这些恒星一定是形成于100到150亿年前。

You must have noticed how tired he sometimes looks.

你一定注意到他有时候显得特别疲惫。

He must have started writing his book a long time ago.

他一定很久以前就开始写这本书了。

It must have reinforced my determination to blend into my surroundings.

这势必让我更加下定决心融入周围环境。

You must have left a tap running in the bathroom.

你肯定忘了关浴室的龙头了。

The law must have teeth, and it must be enforced.

法律必须拥有效力，而且必须强制实施。

I must have something to tell him. Something concrete.

我必须告诉他点什么，必须是具体的东西。

I closed my eyes for a minute and must have dozed off.

我闭了会儿眼，肯定是睡着了。

I realised that I must have imagined the whole thing.

我意识到大概整件事都是我臆想出来的。

He must have come inside to get out of the cold.

他肯定是进来避寒的。

I must have driven past that place thousands of times.

我得有上千次开车经过那里。

Every room must have been stuffed with material things.

每个房间肯定都塞满了东西。

He must have been aware that my parents' marriage was breaking up.

他一定已经知道我父母的婚姻即将破裂。

Something must have gone wrong with the satellite link.

卫星连接一定出了毛病。

Your life since then must have seemed very ordinary.

你的生活从那时起一定非常平淡无奇。