在英语中，不定代词的位置对句子的含义有重要影响。不定代词通常可以放在名词的前面或后面，前者表示数量或程度，后者表示强调。但是，有些不定代词如"some", "any", "no", "every", "each"只能放在名词的前面，不能放在名词的后面。因此，使用不定代词时，需要根据语境来确定其位置，以使句子更准确、清晰。
一般来说，不定代词可以放在名词的前面或后面。如果放在名词的前面，不定代词通常用来修饰名词，表示数量或程度。例如：
- Some apples
- Any problem
- No time
- Every student
- Each book
- Many people
- Few options
- Several ideas
如果不定代词放在名词的后面，通常表示强调。例如：
- The problem is any.
- The time is no longer.
- The student is every one of us.
- The book is each and every one of us.
- The people are many and diverse.
- The options are few and far between.
- The ideas are several and worth considering.
但是，也有一些不定代词只能放在名词的前面，不能放在名词的后面，这些不定代词包括some, any, no, every, each等。例如：
- Some apples (正确)
- Apples some (错误)
- Any problem (正确)
- Problem any (错误)
- No time (正确)
- Time no (错误)
- Every student (正确)
- Student every (错误)
- Each book (正确)
- Book each (错误)
