[析]either作代词时由两个含意，其一是两者中随便哪一个，如：You can take either.其二是两者中的每一个。但要注意的是either后要加单数名词，如果作主语则谓语动词也要用单数形式。
[误]Either you or I are right.
[正]Either you or I am right.
[析]在either…or,或neither…nor连接两个主语时，其谓语动词要与和其相近的那个主语相配。
[误]I have three sisters. Neither of them is a doctor.
[正]I have three sisters. None of them is a doctor.
[析]neither用于两者中无一是，而none则用于多于两者中的人或事物无一是。
[误]He doesn't like Beijing opera. I don't like too.
[正]He doesn't like Beijing opera, I don't like either.
[析]either作为"也"讲时，要用于否定句中，而too则用于肯定句中。
[误]We like both this little boy.
[正]We both like this little boy.
[析]both作同位语时，它在句中的位置有：在be动词之后，如：We are both students.在实意动词之前，如：The parents both want to go to the cinema.用于第一助动词之后，如：We have both read these English novels.使用时要注意以下句子的实际含意：Both of us are not right.应译为：我们俩不都对。Neither of us is right.才应译为：我俩都不对。又如：I can't give you both of the books.意为：两本书我不能全给你，而I can't give you either of the books.才为：两本书我全不能给你。
[误]We each has a ticket for the concert.
[正]We each have a ticket for the concert.
[析]each作句子主语时其谓语动词要用单数形式，如：Each of us wants to learn English well,但each作同位语时，则应以原名词的数为准。
[误]Every of us has to pass the exam.
[正]Each of us has to pass the exam.
[析]every只可作形容词，不可作代词，而each既可作形容词，又可作代词，在作形容词时each侧重强调个体，而every 则侧重于全体。
[误]Everyone of us should do housework two hours a day.
[正]Every one of us should do housework two hours a day.
[析]everyone不可与of结构相连接使用，而every one则可以这样用。
[误]I should read English everyday.
[正]I should read English every day.
[析]要注意的是every day是"每天",而everyday则是形容词为"日常的".如：everyday English日常英语，everyday life日常生活。
[误]There are trees on every sides of the street.
[正]There are trees on each side of the street.
[析]every用于三者或三者以上的每一个，而each用于二者或二者以上的每一个。因为街道只有两侧，所以只能用each而不能用every.
[误]All my parents are engineers.
[正]Both my parents are engineers.
[析]all用于三者或三者以上的全部，而both 则用于两者的全部。
[误]All of students might make some mistakes.
[正]All of the students might make some mistakes.
[正]All students might make some mistakes.
[析]非特指的名词前可用all但不可用all of结构，也就是讲all of结构后面的名词前一定要有定冠词。其他与all有关的习惯用法还有：
all the year round, all week, all day, all winter
[误]The all village was flooded.
[正]All the village was flooded.
[析]all作修饰语时要用在所有修饰词之前。
[误]The post office is on other side of the street.
[正]The post office is on the other side of the street.
[析]单数可数名词如在泛指某一个时用another,而特指时则要用the other,因街道只有两边，而不在这边必定是在另一边，所以要用特指。请参考下表的用法以便于记忆。
单数 复数
泛指 another形容词 作定语 作名词
another代词 other others
特指 the other形容词
the other代词
the other the others
[误]There are ten students here Where are the others students?
[正]There are ten students here.Where are the others?
[正]There are ten students here Where are the other students?
[析]the others=the other students.
[误]The old man has two sons. One is a teacher, another is a doctor.
[正]The old man has two sons. One is a teacher, the other is a doctor.
[析]another用于泛指，如：Is it far from here to the station?I'm sorry. I have no idea. One may say it is quite near; another may say it is far from here.但在特指时则要用the other.它可以用作定语，the other one,也可以用作代词the other,但the other用作代词时它的含意一定是单数。如果指三者或者三者以上的情况时，则要用one…another…the other.或者one…a second…the third…
[误]Some people like sports. The others like reading.
[正]Some people like sports. Others like reading.
[析]在泛指的复数名词前用some…others…others…来表示某些人……某些人……某些人……
[误]Please remember to water the flowers each other day.
[正]Please remember to water the flowers every other day.
[析]every other day为每隔一天。是习惯用法，不要随意改动。又如：on the other hand另一方面。
[误]Many know him, but few likes him.
[正]Many know him, but few like him.
[析]few用于可数名词，意为几乎没有，但few作主语时谓语动词则要用复数形式，而a few为有一些。
[误]You have few friends, haven't you?
[正]You have few friends, have you?
[析]little与few用于句中时，均要按否定句看待。
[误]Much of what you said are true.
[正]Much of what you said is true.
[析]much用于不可数名词，作主语时用单数谓语动词。而many用于可数名词，它作主语时用复数形式的谓语动词。
[误]This room is enough large for the students to live in.
[正]This room is large enough for the students to live in.
[析]enough 可以用作代词，如：There is enough of the food. 又如：Enough has been done for the work,但enough 还可以作形容词来修饰名词，这时enough可以放在名词之前，也可放在名词之后，如：money enough 与enough money都是对的。但当enough作副词修饰形容词时，则只能置于形容词之后了。
[误]I want any books to read. Do you have any?
[正]I want some books to read. Do you have any?
[析]按照语法any用于疑问句和否定句，而some用于肯定句。
[误]Would you like any thing to drink?
[正]Would you like something to drink?
[析]在由would you like发出的问句中，表达了说话者真心实意要为对方提供些饮料，或在说话者想得到对方的肯定答复时，在疑问句中要用some而不用any.
[误]Someone want to meet you.
[正]Someone wants to meet you.