B1
I wasn't sure whether you'd like it.
She asked me whether I was interested in working for her.
I'm wondering whether to have the fish or the beef .
I doubt whether it'll work .
I was merely questioning whether we have the money to fund such a project .
It all depends on whether or not she has the time .
Anyway, it's a good story , whether or not it's true .
whether...or
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I doubt if , I don’t know whether
We use if or whether to introduce clauses after verbs of doubting:
If, whether : typical errors
We use whether, not if, before to-infinitives:
If or whether ?
If and whether : indirect questions
We can use if or whether to report indirect yes-no questions and questions with or. If is more common than whether:
Whether
Whether is a conjunction.