1. Is English an international language?
Yes, it is.
No, it isn't.
No, English isn't an international language.
2. Does Jack hate Maths?
Yes, he does.
No, he doesn't.
No, Jack doesn't hate Maths.
3. Will we take privat lessons from this teacher next year?
Yes, we will.
No, we won't.
No, we won't take privat lessons from this teacher next year.