Everyone等等的单复数

Everyone Someone Everybody Somebody Everything Something Anything Nothing 都是单数,他们相应的复数意义可以用别的形式表达：
Everyone/ Everybody: all people
Someone/Somebody: some people
Everything: all, all things
Something: some things(复数一般指东西,少指事情)
Anything： any things（一般会根据情况,用具体的一些词,如, any books; any good teachers; any parents）
Nothing ： no things（很少会用这个复数）
some.. any.. no..如果后面另外用了复数名词（一定是分开写的,如, some people, any flowers, no favours),就是复数; any和no后面跟复数的情况大大少于单数

Isn't it?这种问句,回答是根据答案,如果是“It is”, 用 yes；如果是it isn't, 用NO
肯定和否定回答?