在英语中，有多种委婉的方式来表达“去上厕所”的需求。以下是一些常用的表达方式：

I need to go somewhere.

I want to wash my hands.

I’m going to the restroom.

I’m going to the bathroom.

I need to powder my nose.

I want to go to the toilet.

I need to use the restroom.

I’m going to the can.

I’m going to the john.

I need to go to the water closet.

根据不同的场合和需要，可以选择合适的表达方式。在正式或礼貌的场合，使用“I’m going to the restroom.”或“I need to use the restroom.”会更为合适。在非正式场合，可以使用“I need to go somewhere.”或“I want to wash my hands.”等较为委婉的说法。