whether

US /ˈweð.ɚ/
UK /ˈweð.ɚ/
"whether" picture
1.

si

expressing a doubt or choice between two alternatives

:
I'm not sure whether I should go or stay.
No estoy seguro si debo ir o quedarme.
She asked whether he was coming to the party.
Ella preguntó si él vendría a la fiesta.
2.

si

introducing an indirect question, often with 'or not' implied

:
Let me know whether you can make it.
Avísame si puedes venir.
It doesn't matter whether it rains or shines.
No importa si llueve o hace sol.