Form a question with the positive and negative verb:
Note that this pattern does not have the impatient connotation that would come with English questions like "Are you going or not?".
你去不去？ Nǐ qùbuqù?
‘Are you going?’
Note that 你去吗? Nǐ qù ma? sounds too short.
他说的对不对？ Tā shuō de duìbuduì？
‘Is what he said right?’
你到底还买不买？ Nǐ dàodǐ hái mǎibumǎi？
‘Do you really still want to buy it?’
晚上聚会她来不来？ Wǎnshàng jùhuì tā láibulái？
‘Will she come to tonight’s party?’
这个饭店的优惠券你要不要？ Zhège fàndiàn de yōuhuìquàn nǐ yàobuyào?
‘Do you want a voucher for this restaurant？’