I'm going to the bathroom.

我想去一下洗手间。

youdao

Unfortunately it did not lock, so before I went in I yelled down the hall, and I just said, "Alright everybody, I'm going to the bathroom."

我当时想上厕所，不幸的是厕所门关不了——于是我进去之前大声向客厅喊。

youdao

When I've finished painting the bathroom, I'm going to do the kitchen too.

我油漆完浴室后，还要油漆厨房。

《牛津词典》

She has a gallon of water on her desk at work. ("I'm constantly going to the bathroom, " she says.) She's given up French fries and French bread, possibly her two biggest diet downfalls, although she gives herself permission to splurge during one meal a week.

CNN: Mom's last words inspire 85-pound loss