英語中有很多的不定代詞，有的指代的是復(fù)數(shù)，如 both，few 或 others 等，有的指代的是單數(shù)，如something，either 或 another 等，其中 each 也是指代單數(shù)的，因此它及對(duì)應(yīng)的短語作主語時(shí)，謂語動(dòng)詞用單數(shù)，然而在有些句子中，each 的存在可能會(huì)影響到主謂一致的判斷。
Each 可以作限定詞或代詞，作限定詞時(shí)，后面接單數(shù)名詞；按照通用的語法規(guī)則，它及對(duì)應(yīng)的短語作主語時(shí)，謂語動(dòng)詞用單數(shù)，例如：
Each employee has been awarded the prize for his or her performances.
每位員工都因其表現(xiàn)而獲獎(jiǎng)。
因?yàn)?each 指代的是單數(shù)名詞，所以當(dāng)它被其他代詞“二次”指代時(shí)，也用單數(shù)代詞，如上句的 his 或 her，然而用復(fù)數(shù)的 their 或 them 來指代 each 的情形也越來越多，目的可能是為了簡化復(fù)雜的his or her 或 him or her 之類的表達(dá)方式，如上句改為：
Each employee has been awarded the prize for their performances.
我們國際象棋俱樂部的每個(gè)成員都有自己的特殊愛好。
Each member of our chess club has his or her own special interests.
Each member of our chess club has their own special interests.
但是無論是用單數(shù)的還是復(fù)數(shù)的單詞，each 及對(duì)應(yīng)的短語作主語時(shí)，謂語動(dòng)詞公認(rèn)用單數(shù)，至于用什么代詞指代 each，要根據(jù)實(shí)際情況來，在保證語法準(zhǔn)確的情況下可以優(yōu)先使用單數(shù)代詞，當(dāng)然使用復(fù)數(shù)的代詞也漸漸流行起來，這個(gè)就像用指代有生命的 whose，它現(xiàn)在也越來越多地被用來指代非生命的物體了，例如：
This is the city whose inhabitants were abducted by aliens.
這就是居民被外星人綁架的城市。
那么當(dāng) each 直接跟在復(fù)數(shù)名詞之后作主語時(shí)，謂語動(dòng)詞是否還是單數(shù)呢？如果是對(duì)于指代復(fù)數(shù)的不定代詞如 both 等而言，它置于復(fù)數(shù)名詞后面作主語時(shí)，謂語動(dòng)詞還是用復(fù)數(shù)，這是毫無爭(zhēng)議的，例如：
They both realize there is a promotion for both of them.
他們都意識(shí)到他們倆都有晉升機(jī)會(huì)。
首先需要肯定的是 each 要跟在復(fù)數(shù)名詞后面，才會(huì)有主謂一致的問題，而 each 跟在單數(shù)名詞后面作主語是錯(cuò)誤的語法，如 I each，it each 等是錯(cuò)誤的，因?yàn)?each 用于指兩個(gè)或兩個(gè)以上的人或事物中的每一個(gè)。
當(dāng) each 跟在復(fù)數(shù)名詞后面作主語時(shí)，謂語動(dòng)詞還是用復(fù)數(shù)，而跟 each 沒關(guān)系，這是主謂一致的一個(gè)常考點(diǎn)，例如：
We each try to persuade him to quit smoking.
我們每個(gè)人都試圖說服他戒煙。
The coach and the quarterback each want to win the championship.
教練和四分衛(wèi)都想贏得冠軍。
這個(gè)就好比作連詞的 as well as 和 in addition to 等對(duì)主謂一致的影響原理一樣，在實(shí)際使用中 as well as 不影響主謂一致，實(shí)際謂語跟著主語變化而變化，例如：
杰克和他的朋友們被邀請(qǐng)參加聚會(huì)。
正確：Jack as well as his friends was invited to the party.
錯(cuò)誤：Jack as well as his friends were invited to the party.
為了更好的區(qū)分 as well as 等附加的信息，我們可以在使用時(shí)用逗號(hào)隔開，這樣就清晰明了了，例如：
Jack, as well as his friends, was invited to the party.
不定代詞雖然“不定”，還是一些語法規(guī)則還是比較“固定”的；萬變不離其宗，所有的不定代詞考的不是指代的對(duì)象，就是主謂一致，因?yàn)榭梢苑诸悮w納。
