Questions & Answers about A luz do banheiro está muito forte.
Because Portuguese normally contracts de + o into do.
- de = of / from
- o = the
- do = of the / from the
So a luz do banheiro literally means the light of the bathroom, which in natural English becomes the bathroom light.
Portuguese usually expresses this kind of relationship with de: X de Y = X of Y.
So:
- a luz do banheiro = the light of the bathroom
- natural English: the bathroom light
Using possession with an apostrophe-like idea is much less common here. Portuguese strongly prefers the de structure for things like rooms, objects, and parts of places.