如果两个先行词在数和性上保持一致，就用其相应的一直的人称代词；如果两个先行词在数或性上不一致，人称代词一般与邻近的先行词在数和性上保持一致。
Neither Mary nor Alice has her key with her.
Neither the package nor the letters have reached their destination
If either David or Janet comes , he or she will want a drink
2．当each, everyone, everybody, no one ,none ,anybody, someone, somebody用作主语或主语的限定词时候,或者anything, nothing, something everything等不定代词作主语时候，其相应的代词一般按照语法一致原则，采取单数形式。如：
Everybody talked at the top of his voice.
None of the boys can do it , can he?
Everything is ready, isn’t it”
3．当主语为复数形式，后跟each作同位语时，如果each位于动词之前，其后的代词或相应的限定词用复数形式；如果 each位于动词之后，其后的代词或相应的限定词用单数形式。如：
They each have two coats
we are each responsible for his own family
4．由and连接两个先行词，代词用复数
如：the tourist and businessmen lost their luggage in the accident
（三） 主谓一致问题
主谓一致是指主语与谓语在数上要一致。把握主谓一致问题，考生主要解决的是对不同结构的主语单复数的认定，进而选择适当的谓语。解决主谓一致主要遵循三个原则：
语法一致原则
意义一致原则
就近一致原则
很多情况下应该综合利用这三个原则来处理主谓一致，在不同情况下可能应用三个原则中的不同原则，具体应用哪种原则应该视具体情况而定。总结如下：
一．谓语动词用单数的情况
1．动名词短语、不定式短语、名词性从句做主语，谓语用单数。如：
Buying clothes is often a time-consuming job because those clothes that a person likes are rarely the cones that fit him or her.
(1987年考研题)
To understand the situation completely requires more thought than has been given thus far.
2．表示时间、距离、金额、重量、面积、体积、容积等度量的名词短语做主语时，谓语用单数。
Two weeks was too long
Five times five makes twenty five
3．一般用and连接的两个单词或短语做主语时候，谓语用复数，但是下面用and连接的主语表示一个概念，谓语用单数：
law and order 法制 soap and water 肥皂水
a cup and saucer 茶杯碟子 fork and knife 刀叉
th
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