yawns are said to be catching...翻译并解释语法?
问题描述：
yawns are said to be catching...翻译并解释语法?
答
据说打哈欠会传染.
这是被动句,
还原成主动句式
People say that yawns can be catching.
被动就是
Yawns are said by people that it can be catching.
可以省略by people
宾语从句that it can be catching.
可以省略成不定式.
变成to be catching.