"We should help grandmother."
Translation:Vi borde hjälpa farmor.
I just saw a question earlier "när ska jag ringa tillbaka" that was translated as "when shall I call back". My understanding of that question is asking what an appropriate length of time would be before calling back, rather than a rhetorical question asking oneself when you will decide to call back. Maybe my interpretation is wrong.. Otherwise I would think that ska should function as 'should' here, no?