Zhè wèizi yǒu rén zuò mɑ?
这位子有人坐吗?
Is this seat taken?
Notes:
这(zhè): this 
位子(wèizi): seat
人" class="hjdict" word="有人" target=_blank>有人(yǒu rén): is there anyone
坐(zuò): to sit
吗(mɑ):question word
Example:
A: 这个位子有人坐吗?
     Zhè wèizi yǒu rén zuò mɑ?
     Is this seat taken?
B: 没有。
     Méiyǒu.
     No.
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