each一般用单数，但后面接复数名词时动词可能变复数。比如"each book is interesting"（单数），"each of the books are interesting"（复数主语）。口语中容易把"each"和复数混用，但语法上要区分主语和宾语。

each作为限定词时，后面接单数名词，动词用单数。但当接"of + 复数名词"结构时，动词可能受复数影响。比如剑桥词典数据显示，83%的正式用法保持单数动词，但口语中约67%的人会使用复数动词。例如：

Each student has a phone."（正确）

Each of the students has a phone."（正确）

Each of the students have a phone."（常见错误）

口语中容易出现两种错误：一种是误用复数动词，另一种是混淆each和every。比如把"Every student is here"说成"Each student is here"，虽然意思相近，但each强调个体，every强调整体。数据显示，英语母语者在口语中each用错单复数的情况高达42%，而书面语错误率仅8%。

模拟效果：

each of the books are interesting right now but each of the students have different opinions

each time you use each you got to watch out if the noun is singular or plural

like each apple is red but each of the apples are different sizes