… who …

结构︰

主语（人）＋关系代名词（Who）＋动词＋…。

说明︰

who 是主格<关系代名词>，引导<形容词子句>，前面的先行词接“人”，后面接<动词>，必须和先行词保持一致。who 可用 that 代替。

The man who called was tired.
打电话的那个男人是疲倦的。
The boy who is speaking to Helen enjoys playing soccer.
正在跟海伦谈话的那男孩喜爱踢足球。
People who use their free time well are usually healthy and happy.
善于利用空闲时间的人通常健康又快乐。