2.性、数、格一致

(1)代词的性一般仅限于第三人称。

China will always do what she has promised to do．

中国总是做她承诺要做的事。

The boy stood at the door with his hat in his hand．

这个男孩正站在门口，手里拿着帽子。

(2)当or或nor连接阳性名词或阴性名词时，代词一般和近者保持一致。

Neither John nor Mary has got what she wanted．

约翰和玛丽都没有拿到他们想要的东西。

If you should see Mary or Thomas，tell him the news．

你要是见到玛丽或托马斯，把这个消息告诉他们。

(3)单数名词由and连接时，相应的代词一般用复数形式。

Food and rent are more expensive than they used to be．

食品价格和房租价格都比以前高。

Jim and Mary spoke on the subject as if they were experts．

吉姆和玛丽说起这个问题来就像他们是内行一样。

(4)当句子的主语是one，并要在句子中多次出现时，一般用第三人称单数代词来代替后面将出现的one或one's;当one在句子中泛指人时，在反义疑问句中也可用you来代替。

One should never blame his friends when he finds himself in trouble．

一个人不要在自己遇到麻烦的时候责怪朋友。

One can't be too careful，can you(one)?

我们要十分仔细，是不是?