问题描述：
下面的句子有错误.你能指出并改正吗?
1.this is mr.zhang.he is a policewoman.
2.is miss li a clerk?yes,he is.
3.look at the robot.they're big.
1.this is mr.zhang.he is a policewoman.
2.is miss li a clerk?yes,he is.
3.look at the robot.they're big.
问题解答：
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