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Much choice is possible concerning the words needed to support an indirect question in a sentence
THE VARIABILITY OF WORDING NEXT TO INDIRECT QUESTIONS
Like most indirect speech, indirect questions usually occupy only part of a sentence, the other part giving such information about them as their originator and purpose. In the following example, the part outside the question is of a kind that most people would probably consider typical:
(a) Economists ask what determines consumer choice.
Here, the indirect question (underlined) is the object of a main verb (ask). The subject of this verb (economists) is the originator of the question, while its tense shows that the asking probably occurs regularly. We also understand that the question is being “reported”, since its first asking comes from someone other than the writer.
Because (a) is such a typical indirect question sentence, its form tends to receive prominent attention in grammatical descriptions of indirect speech. However, indirect question sentences have numerous other possible forms, many not given much attention at all. The question can be not just the object of the sentence but also a subject, complement or partner of a preposition. The idea of “asking” can be expressed with not just a verb but also a noun or adjective. It can even be replaced by alternatives like “explaining” or “knowing”, for example by means of the verb explain or know in (a) instead of ask.
The main Guinlist post on indirect questions touches on all of these points (see 57. Indirect Questions in Formal Writing), but it does not provide an in-depth examination of wording next to indirect questions, and it is this that I wish to conduct here. The only area that I will not consider is wording between parenthetical commas, or even absent altogether. For details of these, see 183. Statements between Commas and 207. Exotic Grammar Structures 4, #4.
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CHARACTERISTICS OF INDIRECT QUESTIONS
In order to examine the wording that can go alongside indirect questions, it is necessary to be sure what an indirect question is. This matter is considered in detail in 57. Indirect Questions in Formal Writing, but essential characteristics are as follows:
1. A question word (or noun equivalent) at the start, without that in front.
2. Standard word order: no part of the verb before the subject.
3. Occurrence (normally) in a noun position inside a longer sentence.
4. Adjacency in sentences to wording indicating asking, explaining or knowing / not knowing.
5. Absence (normally) of a question mark at the end.
The relevance of point 4 here is that it helps to distinguish indirect questions from similar-looking expressions that appear to meet all of the other requirements, like the following:
(b) What Caesar did was illegal/astonishing.
I would not consider what Caesar did here to be an indirect question because the accompanying words do not indicate asking, explaining or knowing / not knowing. An indirect question would be shown by will be investigated (= asking) or is as follows (= explaining) or is debatable (= not knowing).
Much of the variability of the wording alongside indirect questions is in the way that asking etc. is expressed. The various possibilities are as follows.
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WAYS OF INDICATING ASKING ETC.
1. Verbs
Verbs that mean a type of asking, explaining or knowing are the most obvious and likely means of signalling an indirect question. If they can do so with an academic reference, they fall into the category of “citation” verbs (see 76. Tenses of Citation Verbs). Some of the commonest are listed in this blog in 279. Grammatical Differences between Citation Verbs.
Most verbs occur in the active voice with the question as their object, and their subject indicating either the speaker or someone who is being cited, e.g.:
(c) I will now consider when this started.
(d) Jones (2018, p. 6) examines the origins of satellite TV.
(e) Could you tell me where the library is?
The verb consider in (c) could be either asking or explaining. Its slightly informal subject I could be replaced by the name of the communication medium, e.g. this essay or the current chapter (see 46. How to Avoid “I”, “We” and “You”). Alternatively, there could be a starting It is (now) + adjective (e.g. desirable, helpful, important, interesting, necessary, opportune, useful, valuable) or + noun (e.g. time), followed by the infinitive verb to consider (see 103. Representing a Later Statement with “it”). The overall purpose of the question in (c) is topic-introducing.
Sentence (d), with another person’s name as subject, is a report of the kind often found in literature reviews (see 76. Tenses of Citation Verbs). The indirect question starts with a noun (origins), but could equally well have the question word how or where… (see 185. Noun Synonyms of Question Words). The verb examines is an asking one.
Sentence (e) is a polite request. Unusually, it has the addressee you as the subject of an active explaining verb tell. This is possible because the indirect question is introduced with a direct one (necessitating the question mark at the end). It could also be introduced with an ordinary statement, with the speaker its subject: I would like to know….
Although indirect questions typically follow their partner verb in the object position, they can, like most objects, become a subject at the start. Sentence (c), for example, could become:
(f) The moment when this started will now be considered.
The indirect question now starts with a noun (moment) instead of a question word – a seemingly normal requirement at the start of a sentence (see 285. Complexities of Question Words, #2). The verb, moreover, is in the passive voice.
Verbs with an indirect question subject quite often need to be passive, but not always: the active form of a different verb can sometimes be found instead (see 27. How to Avoid Passive Verbs). In (f), for example, will be considered could be replaced by needs consideration. This does not mean, however, that an alternative to a passive verb should always be sought: sometimes a passive will be better (see 69. How Computers Get Grammar Wrong 2).
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2. Nouns
Question-signalling nouns can avoid undesirable aspects of verb use, such as I subjects (as in [c] above) and passive forms. Many are derived from a verb by means of an ending like -sion, -ation, -ment and -al (see 287. Speech and Thought Nouns).
Common verb-derived examples are analysis, clarification, consideration, definition, description, enquiry (into), illustration, identification, indication, investigation (of/into), judgement (about), outline, study, summary and survey. Question-signalling nouns not derived from verbs include issue, matter, moot point, question and uncertainty (about).
Indirect questions signalled by a noun can be incidental to other information in their sentence or its main point. In the first case, they and their signalling noun (the two usually linked by of, e.g. identification of why…) just have a normal noun role – subject, object, etc. – in a statement giving the other information. The reason for of is that the indirect question is often what I have elsewhere called “object-like”: destined to become an object if the signalling noun were to be paraphrased with its related verb. Of is the typical preposition before such nouns (see 31. Prepositions after Action Nouns 1).
Nouns not derived from a verb often need of as well to link with an indirect question, but a different kind, similar in meaning to “which is” (see 160. Uses of “of”, #4). It usually necessitates the before the noun (e.g. the issue / question of why…).
When an indirect question is the main point of a statement, it will occupy either the start, as in (f), or the end. With it starting, the signalling noun follows in a statement like …needs consideration, …is an important question or …defies explanation.
Nouns with no related verb (matter, question, issue etc.) commonly follow a characterising adjective, common examples being central, complicated, controversial, crucial, fascinating, fundamental, important, interesting, key, major, obvious, necessary, puzzling, tricky and vital. The adjective moot can only accompany a … point. A substitute for all of a(n) + adjective + question (etc.) is of interest or of importance (see 198. Indicating Importance, #2).
If a question ends rather than starts a sentence in which it is the main point, a preceding signalling noun is usable in various ways. Verb-derived nouns can combine with a passive “dummy” verb plus preposition, e.g. Consideration will be given to… in (c). The choice of verb depends on the noun: a judgement…about needs BE MADE, an enquiry…into BE UNDERTAKEN or BE CARRIED OUT (see 173. “Do Research” or “Make Research”?). The active of an alternative verb is sometimes possible too, e.g. centre on after consideration.
On the other hand, nouns like matter can accompany BE:
(g) A key question is (or It is a key question) why…
For more on the use after It is…, see 318. “It is” + Noun & Another Verb, #1.
Alternatively, both types of signalling noun can follow there + BE. For example, (c) could start either There will be consideration of… or There is a/the matter of… (see 161. Special Uses of “There” Sentences, #2).
Sometimes, either type of pre-question signalling noun is linked to previous information by means of a verb like LEAD TO or PROMPT:
(h) This observation LEADS TO consideration (or the matter) of why…
Before matter etc. RAISE is also possible; before consideration etc. NECESSITATE is.
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3. Adjectives
Adjectives can accompany an indirect question not just as shown above before an infinitive verb or a noun, but also alone. The possibilities are considered in detail in 300. Adjective Indicators of Indirect Speech.
With indirect questions that are not reported, a signalling adjective is likely to go in front after it is:
(i) It is interesting where insects go in winter.
Other adjectives usable like this include clear (= obvious), controversial, disputed, doubtful (+ whether), fascinating, important, mystifying, obvious, puzzling, tricky, uncertain (= unproven), unproven and unknown. All these perhaps imply the presence of an asking noun like the question of just before the indirect question (see 88. Exotic Grammar Structures 1, #8). The question itself must begin with a question word, not a noun equivalent.
When a question is reported as somebody else’s, a preceding adjective is likely to link with it via a preposition:
(j) Einstein was curious ABOUT why weight changes in elevators.
A few non-reported indirect questions can be expressed similarly:
(k) The durability of Greek drama is indicative OF how perceptive it is.
Other adjectives like curious and indicative include aware (of), baffled (about / as to), (un)certain (about / as to), (un)clear (about / as to), convinced (of / about), doubtful (about / as to), ignorant (about / as to), interested (in), knowledgeable (about), suggestive (of) and (un)sure (about / of / as to). For more about certain, see 226. Words with Complicated Grammar 2, #2. For more about doubtful, see 217. Tricky Grammar Contrasts 1, #7.