你先对他们分类,.
1 someone / anyone / no one
2.something / anything / nothing
3.somewhere / anywhere / nowhere
someone 表示不明确指某个人,主要用于肯定句,疑问句也能用,anyone 有人,主要用于否定和疑问句.表示任何人（用于肯定句）.no one 相当于 not anyone
I need someone to help me.There is someone in the room .Will someone be willing to help me (请求希望得到肯定答复）
There is not anyone in the room / Anyone could win tonight .(今晚任何人可能赢）
Is anyone here
There is no one in the room.No one is willing to help me.
something / anything / nothing 和上面情况基本相同 指物不是指人,someting 某物,某事
anything 某事物,任何事 nothing没有任何东西,没有事
I know something about him ./Do you have something to eat (请求希望得到肯定答复）
You can buy anything you want .I don't know anything about him ./ Is there anything I can do for you?
I know nothing about him .
somewhere / anywhere / nowhere 是副词,在某处/在某处,无论何处/什么地方都不,无处
He must be around here somewere.Is there somewhere safe here
sit anywhere you like .Do you need anywhere to stay for the night?
I can't find my passport anywhere
I have no job and nowhere to live .