1.My mother is a shop assisant and she sells people things.（保持原意）
问题描述：
1.My mother is a shop assisant and she sells people things.（保持原意）
2.I spent half an hour on my homework yesterday.(保持原意）
3.This beautiful skirt cost me 200 yuan.（保持原意、2句）
答
My mother is a shop assisant who sells people things
I spent half an hour doing my homework yesterday.
I spent 200 yuan on his beautiful skirt
I paid 200 yuan for his beautiful shirt.
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