that

that 可以代表事，也可以代表人。在從句中可以做主語或者賓語，做賓語時可以省略，但不能用于非限制性定語從句。代表人時，who比that 用的多，代表物時，that 比which用的多。

例如：

The letter that came this morning is from my mother.今天早晨收到的那封信是我母親寄來的。

Those students that failed the exam will have to take again?？荚嚥患案竦膶W生必須補考。

Have you forgotten the money that i lend you last week? 你忘了上星期我借你錢的事了嗎?

All the people that i invited have agreed come。所有我邀請的人都同意來了。

The hotel that that we stayed at was both cheap and comfortable。 我們住的那家旅館既便宜又舒服。