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Using whether is far more common. It is certainly more formal.

I would like to know whether it is a true story or fabricated.

But we can use if as well in the same sentence.

I would like to know if it is a true story or fabricated.

So when do we use one or the other?

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marked as duplicate by mplungjan, Andrew Leach, Barrie England, Benyamin Hamidekhoo, Brian Hooper Nov 12 '13 at 12:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
could it be as simple as, 'if' to introduce a condition, and in all other circumstances, use 'whether'? –  Joe Nov 12 '13 at 9:56
    
I consider this question: Whether vs. If to be more pertinent. I think the top answer here answers quite nicely the OP's question. –  Mari-Lou A Nov 12 '13 at 10:24

2 Answers 2

If and whether are nowadays usually considered subordinators.

Though their usages overlap, they are not totally interchangeable:

Ask him whether/if I can come. ['if' more colloquial] ['or not' may be faintly implied]

......

If/*Whether he is really a policeman, I'm a Chinaman.

I will come if / * whether she is going to be there. [no 'or not' implied: no choice involved]

......

They talked about whether / *if United still had a chance of winning the league. ['or not' quite strongly implied: 'choice' of alternative possibilities]

I will come whether or not / *if or not she is going to be there. [not may be placed at the end of the sentence] ['choice' (ie alternatives) overtly stated]

See also

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whether is a choice between alternatives, if is not.

The second sentence is not as clear as the first (maybe even syntactically incorrect) and should lose the "or fabricated"

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