buy的过去式和中文

　　You would do well to consider all the options before buying.

　　你购买之前最好对各种选择都考虑一下。

　　We buy our fruit and vegetables at the market.

　　我们在市场上购买水果和蔬菜。

　　Now is a good time to buy a house.

　　现在买房子正是时候。