相互代词 each other / one another
表示「互相」的代词，不能作主语。
A and B + 动词 + each other / one another
要点
- each other 多指两人之间，one another 多指三人以上，现代英语常混用。
- 相互代词在句中作宾语：We help each other. They know one another well.
- 可以加 's 构成所有格：They stole each other's ideas.（互相偷点子）
- 不能作主语：不能说 Each other helped them. 要说 They helped each other.
- 所有格把 's 加在最后那个词上：each other's / one another's —— They borrowed each other's bikes.
- 与 each 连用可以表「每一个对另一个」：They each helped the other.（较书面）
- 三个高频搭配：look at each other、talk to each other、learn from each other。
例句
We should help each other when we are in trouble.
遇到困难时我们应该互相帮助。
The two teams learned a lot from each other.
两支队伍互相学到了很多。
The students in our class know one another very well.
我们班同学彼此非常了解。
They often write to each other in English.
他们经常用英语互相写信。
The two sisters take care of each other.
姐妹俩互相照顾。
Students should give one another more chances to speak.
学生应该给彼此更多开口的机会。
易错提示
- each other 前面的主语必须是复数：They love each other.（不能 He loves each other）
- 「互相」也可以用 each … the other 表达：They each helped the other.（较书面）
- 分清反身还是相互：自己对自己用反身代词（He blamed himself），双方互相用 each other（They blamed each other）。
- 写作里 one another 比 each other 更书面，考场两者都算对 —— 但 each other 用得更多。