讲义

必定；推测 (过去式为must + have + p.p.)

She's smiling at you. I think she must know you.

她在跟你笑。我想她一定认识你。

You have been working all day. You must be tired.

你工作了一整天，一定累了。

She looks pale. She must be sick.

她脸色苍白，一定是很不舒服。

He didn't come. He must have forgotten our date.

他没来，他一定是忘了我们的约会。

I lost one of my gloves. I must have dropped it somewhere.

我掉了一只手套，一定是在哪里弄掉了。

He got full marks on the English test today. He must have studied hard last night. 他今天英文考试满分，昨天晚上他一定很用功。

When I woke up this morning, the light was on. I must have forgot to turn it off last night. 今天早上我醒来时，灯是亮的，我昨晚一定是忘了关了。