do for + noun
The construction do for + noun is like saying "manage" or "contrive" . It is most commonly used in questions.
E.g.
How are we doing for time? — ¿Cómo vamos de tiempo?
What did you do for work? — ¿Qué hiciste para trabajar?
How are you doing for money? — ¿Cómo andas de dinero?
We are doing alright for fuel at the moment — Vamos bien de gasolina por ahora
Use In Articles