Question

I paid 28 yuan for the pen.（改为同义句）

Answer 1

I spent 28 yuan on / buying the pen .
或
The pen cost me 28 yuan.

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Answer 2

the pen costs me 28 yuan.
i spend 28 yuan buying the pen.
it costs me 28 yuan to buy the pen.

Answer 3

the pen costs me 28 yuan;
或者 it costs me 28 yuan to buy the pen