must have done

分类：情态动词

定义

对过去情况的肯定推测，表示’一定已经…’。

结构

must + have + 过去分词

用法

• 对过去发生事情的肯定推测
• 表示逻辑上的必然性

例句

1. He must have forgotten about the meeting.
2. They must have arrived by now.

对比

must do(对现在/将来的推测) vs must have done(对过去的推测)

相关术语

• 情态动词
• 对过去的推测
• must