Question

Nobody ,None ,No one 有什么区别？请详细点。

1. Who helped you clean the classroom yesterday ?
______ . I cleaned it all by myself .
A. Nobody B. None C. Somebody
2. How many students are there in the classroom ?
_______ . They're all on the playground .
A.Nobody B. None C. No one

Answer 1

no one =nobody.没有人的意思。一般回答who,anybody,anyone类的疑问句。
none，常与of连用，反义词是all，可指人，亦可指物。没有谁，没有东西的意思。常回答how many+n,how much +n和any+n.的疑问句。
所以，1，A 2，B。