buy的过去分词？

　　bought例句

　　They've bought themselves a new car.

　　他们给自己买了一辆新车。

　　She bought a small plot of land to build a house.

　　她买了一小块地盖房子。

　　Now is a good time to buy a house.

　　现在买房子正是时候。

　　He gave his children the best education that money can buy.

　　他让孩子们接受花钱能买到的最好的教育。