确保代词和先行词保持一致。
就像句子里的主语和动词必须一致一样，代词也要和它们所指代的名词或先行词保持一致。如果你用一个代词表示一个单数名词，那么这个代词也应该用单数形式。如果要表示一个复数的先行词，那么相应的代词也是复数形式。例如：
Bob caught the dogs and brought them home.
某些代词（不定代词）总是表示单数。
一些词，如anyone, everyone, someone, anybody, everybody, anything, everything, either, neither, nothing 和 no one 总是表示单数，那么和它们相对应的代词也应是单数形式，如：
Everyone must buy her own ticket.
像这种句法结构方面的问题，你可以请教老师。
有人习惯忽略人物性别，用代词his or her 来指代 “Each person is perchasing a ticket”里的“each person”。一些教师认为his or her 用在这里不自然；他们把everyone 看做复数词（everyone must buy their own ticket）。另一些教师则认为一些规范写作是不接受这种把“everyone”看做复数的做法的。
某些不定代词总是表示复数。
Few, many, both和several听起来表示的就是复数，不是吗？
某些不定代词（all, any, more, most, none, and some）既可以是单数也可以是复数，视上下文而定。
In my interview of the actors, all of them said that they wanted to act in Shakespeare's comedies.
“All”和“they”的先行词是“actors”，一个复数词。
让代词临近它所指代的先行词可以避免混淆。如果代词的使用容易使读者混淆，那么就大胆的重复使用名词。下面这句话就是指代混乱的例子：
The President informed the Speaker of the House that all of his opponents should be meeting with him.
是谁的对手（The President's? The Speaker's? ）要见谁呢？这句话需要修改指代不明的代词him 和 his。可以按下面的方法来修改：
The message that the President sent to the Speaker of the House was: "I want to meet with my opponents."
"this"用来指较近的距离或时间，"that"指较远的距离或时间。
This decision by the President is likely to be debated in newspapers in the coming days.
That decision by President Lincoln led to the Civil War.
过多的使用"it"会使文章失色，尤其是当"it"像例句中那样是用来引导句子的：
It is unfortunate that children in some countries do not have good medical care available to them.
而在下面这个例句中，你知道"it"指代的是什么吗？
Watching the chef make the dessert made it seem easy.
你知道怎样才能使这些句子表达清楚吗？结论是重写！
当先行词是以连词（and, or, or nor）连接时，不要忘了相应的代词要与先行词在数上保持一致，如下例：
If Bob and Rick go to the concert, they will need to find their own ride because I don't have room in my car.
一些代词（some, any, all, most, more, none）根据它们所在的语境，既能用作单数，也能用作复数。
什么时候用who, which 或者that？
Who 一般用来指代人或者有名称的动物。虽然Which 和 that 有时候也用来指代群体（如委员会），但是它们一般都用来指观念、事物、地点和没有名字的动物等。下面的例句中包含了这两种用法
Romeo and Juliet, a play that is a favorite of many young actors, tells the story of a young man and woman who are star-crossed lovers from feuding families.
与你的教师讨论怎样给以who, which或者that 开始的词句加标点。
确保物主代词使用正确。
使用物主代词的时候，也要保持一致性。例如：
The student lost his passport.
The children were old enough to be able to carry their own luggage when traveling.
在第一个句子里，单数物主代词“his”用来表示护照属于单数名词“student”。在第二个句子里，“their”则用来表示这些行李是复数名词“children”的。
Make sure that pronouns and their antecedents agree.
Just as the subject of your sentence must agree with the verb, any pronoun you use must also agree with the noun or antecedent for which it stands. If you are using a pronoun to replace a singular noun, you use a singular pronoun; if you are using a pronoun to replace a plural antecedent, you use a plural pronoun. For example:
Bob caught the dogs and brought them home.
Certain pronouns (called indefinite pronouns) are always singular.
Words like anyone, everyone, someone, anybody, everybody, anything, everything, either, neither, nothing, and no one are always singular and their pronouns should be singular, as in this example:
Everyone must buy her own ticket.
Get your instructor's advice on this sentence construction. Some people would prefer the pronoun to be his or her to indicate that each person, regardless of their gender, is purchasing a ticket. Some instructors consider his or her constructions awkward and allow everyone to be treated as plural (everyone must buy their own ticket). Other instructors consider plural construction not acceptable in good writing.
Certain indefinite pronouns are always plural.
Few, many, both, and several sound plural, don't they?
Certain indefinite pronouns (all, any, more, most, none, and some) can be singular or plural according to their context.
In my interview of the actors, all of them said that they wanted to act in Shakespeare's comedies.
"All" and "they" have "actors" as their antecedent, which is plural.
Keeping a pronoun close to its antecedent helps to prevent confusion. Don't be afraid to use the noun again if your reader is likely to get confused. Here's an example of a confusing reference:
The President informed the Speaker of the House that all of his opponents should be meeting with him.
Whose opponents (The President's? The Speaker's?) are meeting with whom? This sentence needs to be revised to change the confusing use of him and his. Here is one way that the sentence can be corrected:
The message that the President sent to the Speaker of the House was: "I want to meet with my opponents."
Use "this" to mean something that is close at hand in space or in time and "that" to refer to something that is farther away in space or time.
This decision by the President is likely to be debated in newspapers in the coming days.
That decision by President Lincoln led to the Civil War.
Excessive use of "it" weakens writing, especially when "it" is used to introduce a sentence, as in this example:
It is unfortunate that children in some countries do not have good medical care available to them.
Or, in this example, can you figure out what "it" stands for?
Watching the chef make the dessert made it seem easy.
Can you figure out ways to make these sentences more effective? The solution is to rewrite!
When you have antecedents joined by a conjunction (and, or, or nor), don't forget to make the pronoun agree in number, as in this example:
If Bob and Rick go to the concert, they will need to find their own ride because I don't have room in my car.
Some pronouns (some, any, all, most, more, none) can be singular or plural according to the context in which they are used.
When do you use who, which, or that?
Who is usually used for people and for animals with names. Which and that are usually used for ideas, things, places, and unnamed animals, although they are sometimes also used for groups of people (for example, a committee).
Romeo and Juliet, a play that is a favorite of many young actors, tells the story of a young man and woman who are star-crossed lovers from feuding families.
Check with your instructor about how to punctuate word groups that begin with who, which, or that.
Make sure you use possessive pronouns correctly.
When you are using possessive pronouns, you also need to ensure agreement. For example:
The student lost his passport.
The children were old enough to be able to carry their own luggage when traveling.
In the first sentence, the singular pronoun "his" is used to show that the passport belonged to the singular "student." In the second sentence, "their" is used to show that the luggage belonged to the plural "children."