When communicating in Chinese you may often make mistakes using Chinese grammar like:

False:

    你是从哪地方来的？

    Nǐ shì cónɡ nǎ dìfɑnɡ lái de

True:

    你是从哪个地方来的？

    Nǐ shì cónɡ nǎɡè dìfɑnɡ lái de?

疑问代词“哪”主要用于定语。“哪”与中心语（“地方”）之间要用量词。“量词”的计量单位是“个”。改“哪地方”为“哪个地方”。

The interrogative pronoun 哪 mainly serves as an attributive. A measure word is needed between it and its head word（地方）. The counting unit of 地方 is 个. Thus we insert 个 between 哪 and 地方.