“洗个澡”我们常说take/have a bath，“想洗个澡”常说want to have/take a bath，但也可以简单地说want a bath。《英语搭配大词典》（1988江苏教育出版社）就有同样的一个例句：

Do you want a bath at once or shall I have mine first?你是马上就洗澡还是我先洗？

▲“美国当代英语语料库”（COCA）中有许多这样的表达：

Do you want a bath or a shower?

Uh, I know, I know you want a bath.

I want a bath and a shave and a place to stay, then a good meal.