和朋友一起放风筝：fly a kite with friends 给弟弟买风筝：buy a kite for younger brother或buy younger brother a kite 做功课：do homework
I have bought a kite for you .这是指买过了风筝所以用 过去完成时
I spent thirty yuan in buying the kite.
Faher give me to buy a. fly kite
I bought you a kite
I speat 30 yuan to buy kites.
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