My sister have a headache.修改病句

网友回答

have 改成has
因为主语是my sister,所有动词要用第三人称单数.
懂了么?======以下答案可供参考======
供参考答案1:
my sister had a headache
供参考答案2:
改为My sister has a headache.
My sister是第三人称单数，谓语动词要用单三形式
供参考答案3:
My sister has a headache.
供参考答案4:
My sister has a headache.
供参考答案5:
have改为has
句子主语My sister是第三人称，所以谓语动词必须用单数形式。