If versus whether: separate the condition from the question.
By Adam Frick · Illustrated draftWould silence count as an answer?
You need a room and ask a colleague about availability. If no room is free, do you still want a reply? I do, when I need to make another arrangement. That practical difference explains my preference for “whether” in a request for an answer either way. The examples separate that question from an instruction to contact you only under a stated condition.
See the supporting references.Imagine receiving these requests.
Ask for an answer either way.
Constructed teaching exampleTell me if the room is available.
Tell me whether the room is available.
State a condition for contact.
Constructed teaching exampleContact me only if the room is available.
Available → Contact me. / Unavailable → No contact under this instruction.
Use the right construction.
Constructed teaching exampleThe team must decide if to proceed.
The team must decide whether to proceed.
Unavailable? Reply no.
Unavailable? No contact under this instruction.
See the published wording.
You must refer to document verification and the Knowledge Base when deciding whether to accept a digital overseas civil registration document.
A useful distinction without a blanket ban
I recommend the distinction because the expected response matters more than the few characters you save. Cambridge permits “if” in many indirect questions, so a colleague who uses that form has not automatically made a grammatical mistake. In a familiar exchange, context may already settle the meaning. Before an infinitive, the example “whether to proceed” has a separate grammatical reason for using “whether”.
References and evidence
- HM Passport Office, “Dealing with customer documents”, “When we will accept an overseas digital document” ↩
- Cambridge’s grammar guidance ↩
Read the evidence and its limits.
Cambridge’s grammar guidance[2] permits both words in many indirect yes-or-no questions. My recommendation is narrower than that description of accepted usage. I teach the distinction because a consistent allocation of jobs can make an instruction more explicit. I do not treat every indirect question with “if” as a grammatical mistake.