【错误表达】

We used to go to buy thins on Sunday.

【讲解辨析】

释义：我们过去常常在星期天去买东西。

辨析：表示去买东西有个固定的表达是：go shopping，不能用go to buy something。

【正确表达】

We used to go shopping on Sunday.

【举一反三】

I will go shopping right now.

我马上要去买东西。