正反疑问（V不V） zhèngfǎn yíwèn
正反疑问（V不V）（zhèngfǎn yíwèn）means “Affirmative-negative question: V 不 V? — an alternative to 吗”. Repeat the verb (or adjective) in its positive and negative form to ask a yes/no question: 你去不去. Formation: 动词/形容词 + 不 + 动词/形容词（肯定+否定并列提问）
Affirmative-negative question: V 不 V? — an alternative to 吗
HSK1Formation
动词/形容词 + 不 + 动词/形容词（肯定+否定并列提问）
Explanation
Repeat the verb (or adjective) in its positive and negative form to ask a yes/no question: 你去不去? 'Are you going?', 是不是? 'is it or isn't it?'. It means the same as adding 吗, but don't use both together. The middle 不 is toneless here (qù bu qù).
Examples
Note
Don't combine with 吗. Middle 不 is neutral tone 'bu'.
FAQ
正反疑问（V不V） — what does it mean and how is it used?
Affirmative-negative question: V 不 V? — an alternative to 吗. Repeat the verb (or adjective) in its positive and negative form to ask a yes/no question: 你去不去? 'Are you going?', 是不是? 'is it or isn't it?'. It means the same as adding 吗, but don't use both together. The middle 不 is toneless here (qù bu qù).
正反疑问（V不V） — how do you form it?
动词/形容词 + 不 + 动词/形容词（肯定+否定并列提问）
正反疑问（V不V） — any usage notes?
Don't combine with 吗. Middle 不 is neutral tone 'bu'.