You use whether when the sentence has the sense of 'something may or may not be true or happen.' You use if with conditional clauses. So: 'I don't know whether I should invite her to my party,' but 'If I invite her to my party, then I fear that she would ruin it.'

We use "whether" when we express a doubt or choice between two possibilities. I don't know whether to answer this question or not. If I try to explain the difference, will the explanation be sufficient enough?

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