(2)不同之处
A. both只能指可数名词，表示两者。
Both of them are from Russia.
他们俩都来自俄罗斯。
I want both books.
这两本书我都要。
B. all既指可数名词，又指不可数名词。在指不可数名词时，表示三者或三者以上。
All agree your idea.
大家都同意你的想法。
All of the books are interesting.
这些书都很有趣。
但是，当all的意思是“一切”时，表示单数意义。
All is the same， just like ten years ago.
一切都没有变，就像十年前一样。
2.both，either和neither的用法
(1)相同之处
A. 三个词都表示两者。
Both of them are my good friends.
他们俩都是我的好朋友。
Either of the books will do.
两本书随便哪一本都可以。
Neither of the answers is right.
两个答案哪一个都不对。
B. 三个词在句中都可以做主语、宾语和定语。
Both of the kites are broken.(主语)
两个风筝都坏了。
She hurt both of her feet.(宾语)
她伤了两只脚。
Both guests have arrived. (定语)
两个客人都已到了。
Which movie do you want to see? Either will be fine. (主语)
你想看哪一部电影?哪部都行。
There are two hammers here. You may use either. (宾语)
这儿有两把锤子。你可以随便用哪一把。
Either coat will be fine. (定语)
(穿)随便哪件衣服都行。
Neither of the twins is here. (主语)
那对双胞胎都不在这里。
Which of the books did you like? Neither (of them)! They were both boring. (宾语)
你喜欢哪本书?都不喜欢!两本都很乏味。
Neither shoe feels comfortable. (定语)
两只鞋都感觉不舒服。
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