I want to buy a present for my mother and father.

　　我想給爸爸媽媽買件禮物。

　　It would be more economical to buy the bigger size.

　　買尺寸大點的更實惠。

　　We make sure our clients get the best that money can buy.

　　我們確保客戶買到最好的產品。

　　We need to buy some new furniture.

　　我們需要買一些新家具。

　　They've bought themselves a new car.

　　他們給自己買了一輛新車。