Not all dogs have this skill.是该用have而不是has吧?

Not all dogs have this skill.是该用have而不是has吧? All dogs have four legs还是All dogs has four legs. She does not have a basketball.为什么是have而不是has? 人名是该用has还是have 为什么Dose she have a sister用have,而不是has What does she have为什么这用have而不是has? They each year has fuor ball games 这句话为什么是用has而不是用have How much time has we left?为什么是用has?而不是用have呢? have/has not heard Have skill you The boy has a pen.(改为否定句） 为什么是does not have,而不是hasn't? have/has 后为什么是come 而不是 came ?