你打算什么时候去买东西应该用什么时态

When do you plan to go shopping?
When are you going to go shopping?
When are you intended to go shopping?
一般现在时

要用将来时啊！不过答案应该是这样说的，When are you going to do some shopping?
be going to do sth 是将要做某事，打算做某事，准备做某事的表达方法
去购物你也可以将do some shopping换成 go shopping

将来啊~~~打算吗

When are you going to do shopping?