i Register
In some senses, whether is marked as obsolete. Watch for register when choosing this word.
ADJ.
correct, hard, little
It's hard whether you're trying to decide between two good job offers.
VERB + WHETHER
answer, decide, depend, depends, doesn't, don't, know, make
It depends whether you prefer coffee or tea in the morning.
WHETHER + NOUN
fortune, he's, holmes, literature, luck, machines, men, twayne
We couldn't tell whether luck or skill had helped him win the competition.
PREP.
on, on, upon
The success of the project depends on whether we can secure funding by next month.
ADV.
intentionally
I didn't know whether he intentionally ignored my messages or just forgot about them.