我要去买东西用英文怎么说

你可以说 "I'm going shopping" 或 "I'm off to buy some things."

来源： 这是一种常见的表达方式，在日常生活和商务场合都可以使用。

例句：

"I need to pick up a few things at the store. Wanna come with?"
(我需要在商店里买几样东西，你想和我一起吗？)
"I'm headed to the mall to do some shopping for the weekend."
(我正在前往购物中心，为周末买点东西。)
"Can you grab me some milk while you're at the grocery store?"
(你去杂货店的时候可以帮我买点牛奶吗？)