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“Whether… or…” may show indirect questions, denied conditions, or a pair of simple alternatives
THE COMPLICATIONS OF “whether … or … “
Whether… or… is one of various ways of signalling the existence of alternatives (see 266. Indicating Alternatives, #1). It is also one of the combinations mentioned in these pages in 64. Double Conjunctions, alongside such pairs as both… and… and either… or… . However, it seems to be more complicated than the other double conjunctions, and hence worthy of closer attention in a post to itself.
One special feature of whether… or… is its inability to stand alone as a sentence. Although there usually has to be a verb (mentioned or “understood”) after whether and another verb after or, there still needs to be at least one more verb in the sentence in order to make it complete. In grammatical terms, whether… or… introduces two “subordinate” clauses, and hence cannot supply the “main verb” that all sentences need. Most other double conjunctions supply either a main verb alongside a subordinate one or two main verbs.
Grammar books tend to say that whether… or… has two separate uses: in indirect questions and in conditional sentences. I feel, though, that there is a third one too: more like either… or… than anything else. I aim here to describe all three of these uses and to indicate when whether… or… should be used instead of whether, if… or… and either… or… .
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USAGE IN INDIRECT QUESTIONS
As a question word, whether always makes indirect rather than direct questions (see 285. Complexities of Question Words, #5). The use with or corresponds to two direct questions with or between them and no question word, like this:
(a) Do you wish to proceed or (do you wish to) cancel?
Direct questions without a question word are familiar to most learners of English as “yes/no” questions as they expect an answer of “yes” or “no”. However, when they are linked by or this description is misleading, since often the expected answer is no longer “yes” or “no”, but instead needs to be a repetition of one of the two verbs – for example either (I wish) to proceed above or (I wish) to cancel (see 297. Types of Response to a Question, #4).
The indirect equivalent of (a) would normally need some accompanying words signalling its indirectness, such as I wonder… or The question is… (see 219. Wording next to Indirect Questions). The first question would then start whether (or if) you wish…, without do, the second with or (you wish)… (see 57. Indirect Questions in Formal Writing).
Like most indirect questions, those with whether… or… usually occupy noun positions in sentences. In the object position, they tend to follow a verb of asking, explaining or not knowing, like WONDER, SHOW, TELL or DOUBT, rather than one of knowing like UNDERSTAND. Usage after a preposition is often linked to an adjective, like this:
(b) Jones (2018, p. 62) is interested in whether…
Negative adjectives seem particularly likely to precede a whether… question, with or without or… . Common examples are doubtful, uncertain, unclear and unsure. The linking preposition is usually about or as to, but is often left out (see “Expansion with that” in 203. Expanding an Adjective with Words after it).
One other way in which whether… or… questions (and simple whether… ones) differ from other indirect questions is in the inability of whether to be paraphrased with a noun (see 185. Noun Synonyms of Question Words).
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USAGE LIKE CONDITIONAL “if”
This use of whether… or… again links two verbs with a third, but is adverb-like rather than noun-like – it is outside the typical noun positions in a sentence of subject, object and complement. Examples are:
(c) Whether they WON or LOST, the children received a prize.
(d) Drug-smuggling WILL CONTINUE whether supply IS TARGETED or demand (IS TARGETED).
The relation to conditional if sentences is closer in (c) than (d). Sentence (c) is an example of what I call “condition-denying”. A condition is something that must happen or exist before something else can happen or exist (see 118. Problems with Conditional “if”). In sentence (c), the whether… or… part contains a logically possible condition for the occurrence of the main event: winning something is usually a condition for receiving a prize. However, the use of whether…or… denies a link between these two events.
Sentence (d), on the other hand, does not contain a denied condition: neither targeting supply nor targeting demand is a logical condition for drug-smuggling to continue. Rather, they are logical conditions for it to stop.
What the two sentences above have in common is that they deny the relevance of the whether… or… ideas to the main one: they say that the main one is not affected by these ideas. This meaning is confirmed by the fact that in both cases whether can follow both regardless of and no matter, two common means of showing unimportance or irrelevance (see 199. Importance and Unimportance).
It is notable that in both sentences the two possibilities combined by whether… or… are mutually exclusive opposites. In (c) there is no other possibility than winning and losing; in (d) supply and demand are the only areas that can be controlled. In (c), this situation means we can infer that a prize was received by all of the children. In (d), we infer that drug-smuggling cannot be stopped at all.
The exclusiveness of the two ideas linked by whether… or… seems to be a necessary feature of its adverb-like use. If we wish to assert the irrelevance of two logically possible conditions that are not the only ones, if seems a more likely choice. Consider this:
(f) Demand for some products will not fall if prices rise or substitutes appear.
Knowing that other factors can cause demand to fall, such as fashion, we would perhaps prefer if here to whether.
Sometimes the condition-denying use of whether can be paraphrased with other wording. If two opposite adjectives with BE are involved, be it or be they is an option (see 88. Exotic Grammar Structures 1, #6). If two nouns are involved, we could use come… or… (see 228. Exotic Grammar Structures 5, #4).
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USAGE LIKE “either … or …”
In this third use, neither of the words whether… or… is followed by a verb, and either… or… will also be grammatically possible. An example is:
(g) Success is possible whether/either through hard work or basic ability.
Note that whether… or… only equates to either… or… when no verbs are involved. Either… or… with verbs cannot be replaced by whether… or… in a sentence like the following:
(h) Clients can either PAY immediately or WAIT until they depart.
The difference between either and whether in sentences like (g) seems to be the level of importance that they give to the alternatives listed after them. Either suggests that they are being communicated to the reader as important new information, whereas whether may imply that the reader already knows them, the more important point of the sentence being the message of the preceding words – success is possible in (g).
Consider this further example:
(i) Please write clearly, either in ink or pencil.
Either seems better here if the speaker assumes the addressees do not yet know that ink and pencil are the allowed means of writing, so that the sentence is providing this information. Whether seems preferable, on the other hand, if the addressees have already been informed of the allowed possibilities, the need to write clearly being the primary message. The custom of saying something that the addressee is expected to know already is widespread in English: for other examples, see 156. Mentioning what the Reader Knows Already.
This difference between the meanings of whether and either may affect the punctuation before them. Whether seems to need a comma most of the time. Either may have one only to show that the information before is being given as much focus as that after, rather than less. Thus, in (i) the comma before either means that two instructions of equal focus are being given (the need to write clearly and the need to use ink or a pencil), whereas in its absence the second instruction would be receiving more focus.
One final noteworthy point is that both either… or… and whether… or… can be ambiguous in the same way. They might show either that only one of the alternatives is the right one (the speaker not being sure which) or that there is a free choice between them. Both meanings seem possible in (g), but (i) has only the latter.