下午去拜访爷爷奶奶用英语怎么说

"I'm going to visit my grandparents this afternoon" is a common way to express the idea in English.

The expression comes from the English language and is a common way to talk about plans.

Example:

"I'll be heading to my grandparents' place this afternoon."
(我今天下午要去爷爷奶奶家。)

"I have plans to see my grandparents later today."
(我今天晚些时候有计划去拜访爷爷奶奶。)