either + singular noun
后面接可数名词单数
Either option works.
两个选项中的任何一个都可以。
两边的；两个中的每一个
先理解核心含义，再看它在真实句子里的用法。
两边的；两个中的每一个
Being one and the other of two; each.
There are big trees on either side of the narrow path.
狭窄小路的两边都有大树。
用法提示：either 作形容词，与 side 搭配，意为‘两边的’，强调道路两侧都有树。
Candles stood at either end of the dining table.
餐桌的两端各立着蜡烛。
用法提示：either 作形容词，与 end 搭配，意为‘每一端的’，强调两个端点中的每一个。
She can write her name with either hand.
她的左右手都能写自己的名字。
用法提示：either 作形容词，修饰 hand，意为‘每一只手的’，整个句子强调两只手都具备这个能力。
后面接可数名词单数
Either option works.
两个选项中的任何一个都可以。
后接复数名词，谓语动词常用单数
Either of the methods is effective.
这两种方法中任何一种都有效。
用于连接两个并列的名词或短语
You can choose either red or blue.
你可以选择红色或蓝色。
grammar · medium
易错句子Either books are interesting.
正确表达Either book is interesting.
either 作形容词时修饰单数可数名词，后接复数名词 books 是错误的。
grammar · medium
易错句子Either sides of the road have trees.
正确表达Both sides of the road have trees.
要表达“两边都”时应用 both，而 either 表示“两者之一”或“每一方的”，且修饰单数名词。
both 强调两个都包括，后接复数名词；either 强调两个中的任意一个，后接单数名词。
any 用于三个或三个以上事物中的任意一个；either 只用于两者之间。
neither 表示两者都不，是否定意义；either 表示两者中的任意一个，用于肯定或疑问句。
Choose the next layer that will help you use either with more confidence.
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