lets go shopping是什么時態(tài)

　　例句：

　　I've got a bit of shopping to do.

　　我要買點東西。

　　In the afternoon they went shopping.

　　他們下午去購物了。

　　I'll do the shopping this afternoon.

　　我今天下午要去購物。

　　I have to go shopping this afternoon.

　　我今天下午得去商店買東西。