We need to buy some new furniture.
我们需要买一些新家具。
They've bought themselves a new car.
他们给自己买了一辆新车。
I went to buy a paper at the corner dairy.
我到街角的.小店去买了份报纸。
You'll have to choose whether to buy it or not.
买还是不买，你得作出选择。
Could you watch my bags for me while I buy a paper?
我去买份报纸，你能替我照看一下我的包吗？