肯定回答：Yes, it is.没有Yes，is it.一般用yes it is是对一般疑问句的肯定回答
否定回答：No, it is not.没有No, is not it
注意:双重否定表肯定
肯定回答：Yes, it is.没有Yes，is it.
否定回答：No, it is not.没有No, is not it.
双重否定表肯定。英语要结合语境看，有时no表肯定，yes表否定。
