A good general pattern that you'd probably want to use, might be:
Sería bueno si pudieras
Y. => It would be great, if you could
Y is the requested
action. (Note: In some cases, the
Sería bueno could come
si clause, but both are equivalent.)
- Sería bueno si pudieras ir a la tienda despues del trabajo. => If you could go to the supermarket after work, that would be great.
- Sería bueno si pudieras avisarme cuando llegues al areopuerto. => If you could let me know when you land at the airport, that would be great.
This pattern can be further generalized by replacing
bueno with any other
adjective that could describe the result (e.g.
triste (sad), etc.) and by making the
si clause any action in the imperfect subjunctive. (See: If-Then Clauses in Spanish.)
Sería muy triste si ella no quisiera ir contigo. => It be pretty sad if she didn't want to go with you.
I hope this helps!