如:It was I that first arrived at the airport. 是我第一个到达飞机场的。the ones用来代替前面特指的复数名词，有时用those代替，如:Mr Zhang gave me a very valuable present， one that I had never seen. 张先生给了我一件非常有价值的礼物——一件我从来没有见过的礼物。
