Nín yào jǐ pínɡɡuǒ?
False: 您要几苹果?
Nín yào jǐ ɡè (ɡōnɡjīn) pínɡɡuǒ?
True: 您要几个(公斤)苹果?
用“几”询问数量时,“几”与中心语之间一定要用量词。“苹果”的计量单位可以用“个”,也可以用“公斤”。
There must be a measure word between 几 and its head word in a sentence using 几 to inquire number. Apples are usually calculated in units of 个 or 公斤, so either 个 or 公斤 should be added before 苹果.