When the verb, the adjective or the modal verb contains only one character:
王:你们明天去不去他家?
Wáng :nǐ men míng tiān qù bú qù tā jiā ?
Wang: Are you (plural) going to his house tomorrow?
张:我去,我太太不去。
Zhāng :wǒ qù ,wǒ tài tài bú qù 。
Zhang: I am going; my wife is not.
丁:你累不累?
Dīng :nǐ lèi bú lèi ?
Ding: Are you tired?
陈:不太累。
Chén :bú tài lèi 。
Chen: I am not too tired.
李:明天会不会下雨?
Lǐ :míng tiān huì bú huì xià yǔ ?
Li: Will it rain tomorrow?
张:不会。
Zhāng :bú huì 。
Zhang: It won’t.
[1] Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.