Foreigners often make some strange mistakes in Chinese when they study the most difficult language--- ---Chinese. We try to analyze typical sentences to correct these errors.

          Xīnɡqī yī hěnduō rén qù shénme wán?
False: 星期一很多人去什么玩?
          Xīnɡqī yī hěnduō rén qù shénme dìfɑnɡ(nǎ'ér) wán?
True: 星期一很多人去什么地方(哪儿)玩?

“什么”单用时,用来询问事物。跟在动词“去”后面的,应是表示处所的词语。这个句子有两种改法;或者在“什么”后加上“地方”一类的词;或者删去“什么”,改用“哪儿”。
什么 alone is used to inquire things. The verb 去 can only take objects of locality. There are two possible ways of correction: put 地方 after 什么, or use 哪儿 instead of 什么.