Difference between whether and if

The subordinating conjunctions if and whether can both be used to introduce indirect Yes / No questions.

  • I don’t know if she will come. OR I don’t know whether she will come.
  • I asked if she was interested in the offer. OR I asked whether she was interested in the offer.

In some cases, whether is preferred to if.

After a preposition

Only whether is possible after a preposition.

  • Incorrect: We haven’t settled the question of if we should move into a new house.
  • Correct: We haven’t settled the question of whether we should move into a new house.

Before to-infinitives

Only whether can be used before to-infinitives.

  • Incorrect: They can’t decide if to wait or leave.
  • Correct: They can’t decide whether to wait or leave.

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  5. Must and have to : differences
  6. IELTS writing task 1 (letter)
  7. Whose and who’s
  8. Improve your vocabulary
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