Whether is a conjunction used to introduce an indirect question or to express a choice between two alternatives. It means if when reporting uncertainty and links two possibilities in either-or constructions.
What Does Whether Mean?
Whether comes from Old English hwæþer, meaning "which of two". Its Germanic root is related to Old High German hwedar and Gothic hvaþar. The original sense expressed a choice between exactly two options, and this binary quality persists in modern English: whether still typically implies two alternatives, even when only one is stated explicitly.
In contemporary English, whether performs two main functions. First, it introduces reported yes/no questions: I wonder whether she is coming is the indirect version of Is she coming? Second, it links two stated alternatives: whether you study or not, the exam will happen. In both uses the conjunction signals that two possibilities exist and the speaker is uncertain which applies, or that the statement holds for either one.
Understanding whether is particularly important for academic and professional writing, where it appears frequently in formal indirect questions and conditional structures. It is also a common source of confusion for ESL learners, who often mix it up with the homophone weather or overuse if in contexts where only whether is correct.
Example Sentences
| Sentence | Level | Usage note |
|---|---|---|
| I don't know whether the shop is open today. | A2 | whether introducing an indirect yes/no question |
| She was not sure whether to use "further" or "farther" in the sentence. | B1 | whether + infinitive, expressing indecision |
| The teacher asked whether any students had questions before the test. | B1 | whether in reported speech after a verb of asking |
| Whether or not you agree with the policy, you are still required to follow it. | B2 | whether or not at the start of a clause for emphasis |
| The outcome of the negotiations depends on whether both parties are willing to make concessions. | C1 | whether clause as complement of a prepositional phrase |
Collocations
| Collocation | Example |
|---|---|
| whether or not | Whether or not it rains, the match will go ahead. |
| decide whether | I still need to decide whether to apply for the job. |
| wonder whether | I often wonder whether I made the right choice. |
| consider whether | The board must consider whether the plan is viable. |
| ask whether | She asked whether anyone had seen her keys. |
| know whether | He didn't know whether to laugh or cry. |
| unsure whether | I'm unsure whether the meeting has been rescheduled. |
| regardless of whether | You should save regularly, regardless of whether your work is important. |
| question whether | Critics question whether the new law will be effective. |
| check whether | Please check whether the door is locked before you leave. |
Usage Notes
When to Use Whether (and Not If)
- Use whether directly before a to-infinitive: I can't decide whether to go. — if is not possible here.
- Use whether when "or not" follows immediately: whether or not it works. With if, "or not" must go at the end of the clause.
- Use whether when the clause acts as the subject of the sentence: Whether he arrives on time is uncertain.
- Use whether after prepositions: The debate about whether taxes should rise… — if cannot follow a preposition.
- Both whether and if are acceptable when the clause is an object after verbs like ask, know, wonder — but whether is more formal.
Common Mistakes
Watch Out For
I couldn't decide whether or not to going.
I couldn't decide whether or not to go. (whether + bare infinitive, not gerund)
The question of if she would accept the offer was unclear.
The question of whether she would accept the offer was unclear. (whether after a preposition, not if)
I don't know weather the flight is delayed.
I don't know whether the flight is delayed. (whether = conjunction; weather = atmospheric conditions)
Whether if you study, you will pass.
Whether you study or not, you will pass. (never combine whether and if together)