Questions & Answers about Не могла бы ты подсказать, на какой станции нам пересесть?
Why does it say могла? Why not мог or можешь?
Могла is the past tense feminine singular form of мочь (to be able).
It agrees with ты, when ты is referring to a woman or girl.
So:
- Не мог бы ты... = if speaking to a man
- Не могла бы ты... = if speaking to a woman
- Не могли бы вы... = polite/formal you, or plural you
Russian often uses this past-tense + бы structure to make a request sound softer, similar to English Could you...
Why is the request in the past tense? It seems odd to say могла instead of a present-tense form.
This is a very common Russian way to make a polite request.
The pattern:
Не мог(ла) бы ты... ?
literally looks like Couldn’t you... ?, but in real usage it means something like:
- Could you... ?
- Would you mind... ?
So the past tense here is not really about past time. It is part of a polite conditional-style request.
Compare:
- Ты можешь подсказать? = Can you tell me?
This is understandable, but more direct. - Не могла бы ты подсказать? = Could you tell me?
This sounds softer and more polite.