定义 / 说明
这些限定词都用于谈“群体中的成员”，但关注角度不同：有的逐个看，有的整体看，有的只针对两个选项。由于意义接近，学习者即使句子其余部分正确，也常选错词。数的一致也很关键，因为其中一些词后面接单数名词。它们在说明、比较和指令中非常常见。
关键规则
- each：逐个看群体成员（常用于较小群体）。
- every：把群体作为整体来谈。
- both：两个都。
- either：两者之一。
- neither：两者都不。
- each/every 接单数名词；both/either/neither 常用于两个对象。
例句
- Each student has a book. - 每个学生都有一本书。
- Every room was full. - 每个房间都满了。
- Both answers are possible. - 两个答案都可能。
- You can choose either option. - 你可以选任意一个选项。
- Neither answer is correct. - 两个答案都不正确。
常见错误
- ❌ Each students have a book. -> ✅ Each student has a book.
- ❌ Every people were happy. -> ✅ Everyone was happy. / All the people were happy.
- ❌ Neither of the answers are correct. -> ✅ Neither of the answers is correct.