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Indirect speech can often be indicated with an adjective instead of a verb or noun
THE VARIABILITY OF INDIRECT SPEECH
Indirect speech rarely occupies a sentence by itself. Usually, its status as indirect speech will be indicated by an accompanying word expressing some kind of speaking or thinking (see 127. When to Use Indirect Speech).
The commonest type of such word is a verb (e.g. Experts agree …; We believe…), but there are other possibilities too. Nouns are common, reflecting the frequent ability of verbs in general to be paraphrased with a noun (see 287. Speech and Thought Nouns). Less common, but still worth knowing about, are adjectives. Here I wish to show how adjectives can indicate indirect speech and which ones are available.
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A SPECIAL FORM OF INDIRECT SPEECH
First, however, I wish to highlight a kind of indirect speech that is rarely mentioned in standard descriptions. Consider this example of the commonly-mentioned kind:
(a) Galileo believed (that) the earth circled the sun.
Here, an indirect statement (underlined) is linked by that to a thought verb believed. Even if that was not visible in the sentence, its presence would still be understood. It is necessary because the indirect statement also contains a verb (moved), the rule being that two verbs cannot exist in the same sentence unless accompanied by a “joining” device (see 30. When to Write a Full Stop). That here is a joining device of the conjunction kind (see 153. Conjunction Uses of “that”, #1).
Other joining devices are found with other kinds of indirect speech. Common ones are question words (whether, why, who etc.) in indirect questions, and special verb forms within the indirect speech that remove the need for any separate joining word, such as -ing after MENTION + noun (…mentions water dripping…) and to infinitives after command verbs like TELL + noun (…told everyone to…). Like that, these are all commonly-described features of indirect speech (see 279. Grammatical Differences between Citation Verbs).
Yet not all indirect speech contains a verb. Indirect statements after some speech verbs – CRITICISE, DEFINE, DISMISS and DESCRIBE, for example – have as instead of BE:
(b) Jones dismisses the project as unnecessary.
A few verbs, such as CALL, even disallow as (…calls the project unnecessary above: see 92. Verbs with an Object + “as”).
In some other cases, verb-less indirect speech follows a preposition. For example, …believed that the earth moved… in sentence (a) above could be paraphrased as …believed in the movement of the earth…. Changing that to in becomes necessary when a verb like moved is replaced by its equivalent noun movement. The preposition has to be in because that is the “typical” one after BELIEVE (see 111. Words with a Typical Preposition).
Replacing an indirect-speech verb with a noun like this, however, is probably not the primary use of prepositions before indirect speech. Instead, what they seem particularly suited to is enabling abbreviation of indirect speech down to just one of its nouns. Consider this indirect question:
(c) Many asked when the project would begin.
A possible abbreviation here would be just the noun the project. To link this with asked, the preposition about would be needed (…asked about the project). Other verbs like ASK (about) include ARGUE (about/ for/ against), ASSURE SOMEONE (of), KNOW (about), PRAY (for), SPEAK (about) (equating to SAY THAT) and WARN (about).
However, the majority of verbs before a lone indirect speech noun do not need a facilitating preposition – it is mainly speech / thought nouns and adjectives that do. Most verbs simply have the noun as their object. For example, an abbreviation of sentence (b) above would be …dismisses the project. Other verbs like DISMISS include CLARIFY, CONSIDER, CRITICISE, EXPLAIN and ILLUSTRATE.
A few verbs allow no abbreviation at all of indirect speech. Common ones are CLAIM (= assert), SAY and THINK (= believe).
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IDENTIFYING SPEECH AND THOUGHT ADJECTIVES
Some adjectives are more easily classified than others as introducers of indirect speech. The most obvious ones imply communication in their meaning. For example, agreed (derived from the speech verb AGREE), divided and unanimous imply multiple people talking to each other about the associated idea, while insistent (derived from INSIST), unequivocal (= explicit or unambiguous) and non-committal (= avoiding definiteness) all indicate a manner of communication.
It may seem surprising that agreed and divided are included in the adjective examples above given that they are often considered to be the verb forms known as participles. However, it is quite common for many English participle forms to be used slightly differently as adjectives. For advice on recognising their adjective usage, see 245. Adjectives with a Participle Ending.
Thought adjectives are harder to recognise as introducing indirect speech because, of course, they can describe unspoken thoughts as well as spoken ones. It can help to recognise sub-categories. The most likely kind to introduce indirect speech is perhaps what I call “fact-related”: adjectives like aware, certain, convinced, dismissive and doubtful. Slightly less likely, perhaps, are ”will” adjectives, such as adamant, interested, keen and willing. Least likely are probably “emotion” adjectives, such as frustrated, happy, satisfied, surprised and upset (see 203. Expanding an Adjective with Words after it, #2).
With all thought adjectives, the absence of a speech clue within their meaning is often compensated for by an external one, such as a source reference:
(d) Chung (2021, p. 54) is certain/frustrated that handwriting will become a lost art.
The academic reference after Chung here makes it clear that a feeling was expressed in a statement of which the end of the sentence must be an indirect form.
Other examples of indirect speech introduced by an adjective are:
(e) Einstein was unsure (about) why weight changes in elevators.
(f) I am aware that change is necessary.
The indirect speech in (e) here is a reported question, while that in (f) is a non-reported statement.
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USING SPEECH & THOUGHT ADJECTIVES
Like all adjectives, speech / thought ones usually describe a noun – typically one naming the source of the indirect speech being expressed. They cannot go directly before this noun; most follow it with a link verb like BE in between, as in sentence (d), but a few occupy an alternative adjective position (see 283. Lesser-Known Features of Adjectives, #2).
Like verbs and nouns of speech and thought, adjectives do not all link in the same way with indirect speech. The main possibilities and common adjectives associated with each are as follows.
1. With that or a Preposition
This is a property of certain (= convinced) in (d) above. To be classified as usable with that, an adjective must allow it more widely than just in sentences starting it is… (see 203. Expanding an Adjective with Words after it, “Expansion with that”).
Possible prepositions after certain are about and of (see 226. Words with Complicated Grammar 2, #2). Each may introduce either a complete indirect statement (containing an -ing verb) or an abbreviated one comprising just a noun, e.g. …about handwriting in (d).
About is the main or only possible preposition with many but not all adjectives that also allow that…. The possibilities are:
ABOUT
adamant, clear (= not confused), correct, definite, doubtful (= doubting), explicit (= plain), optimistic, perplexed, persuasive, positive (= convinced), puzzled, sceptical, sympathetic, unambiguous, unanimous, unequivocal, vociferous
ABOUT OR ANOTHER PREPOSITION
agreed (on), certain (of), confident (of), convinced (of), hopeful (of), sure (of), suspicious (of), uncompromising (on)
ANOTHER PREPOSITION
afraid (of), (un)aware (of), agreeable (to), desirous (of), insistent (on), proud (of), thankful (for)
After certain and hopeful, of and about usually express slightly different meanings. Certain of X indicates certainty that X exists, while certain about X may indicate certainty relating to some aspect of X, taking X’s existence for granted. This is the same contrast that of / about expresses after nouns like knowledge and news (see 134. Words with a Variable Preposition, #2).
After adamant and insistent (plus desperate, determined, eager, keen and willing), a future-referring that statement may contain a verb in the “subjunctive” form (see 269. Exotic Grammar Structures 7, #7).
Most of the above adjectives can precede indirect questions as well as statements, but still usually need their preposition, e.g. certain about why… (see 219. Wording next to Indirect Questions, #3). After doubtful and sceptical, the difference between that… and about whether… is unusually small (see 217. Tricky Grammar Contrasts 1, #7).
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2. Only with a Preposition
Adjectives that link in this way can again introduce indirect questions as well as statements. They rarely allow a choice of prepositions. Common ones are:
ABOUT
ambiguous, curious, eloquent (also on), helpful (also on), ignorant (also of), inquisitive, non-committal (also on), relaxed, vague
OF
accepting, appreciative, critical, demanding dismissive, indicative, questioning, suggestive, (un)supportive
TO
attracted, opposed, resigned, sympathetic
OTHER
baffled by, bewildered by, divided over, eloquent on (also about), familiar with, intent on, interested in, interesting on
Note that curious sometimes replaces about with to discover, to know, to see or similar.
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3. With that or a to Verb
An adjective of this kind is keen:
(f) Gomez (2019, p. 5) is keen that nothing changes.
Keen can be followed by that here because the subject of the later verb changes (= nothing) is different from the subject of is (= Gomez). The infinitive form to change would also be possible in this situation, provided that is replaced by for (…keen for nothing to change).
By contrast, if the two verb subjects are the same, keen normally needs a directly-following infinitive:
(g) Gomez (2019, p. 5) is keen to keep things unchanged.
A further particular property of keen is ability to replace both that and to with the preposition on: keen on nothing changing in (f) and keen on keeping… in (g).
Other adjectives like keen (possible prepositions shown in brackets) include desperate (for), determined, eager (for), happy (with, about), impatient (for), reluctant (about) and (un)willing (see 83. Adjectives before a “to” Verb, #2).
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4. With Just a Question Word
The normal requirement for a preposition between an adjective and an indirect question (see #1 above) disappears when the adjective follows it is:
(h) It is interesting where insects go in winter.
In sentences like this, the adjective describes the indirect speech rather than the speaker, and the question is not a reported one. For further details, see 88. Exotic Grammar Structures 1, #8.
Where a question is reported as someone else’s, a few negative adjectives allow but do not compel the preposition to be dropped before it:
(d) Einstein was unsure (about / as to) why weight changes in elevators.
Similar adjectives include mystified, pessimistic, uncertain and unclear (= uncertain), plus their positive equivalents after not. The optional preposition is always about or as to, and always becomes compulsory if the question is abbreviated or its question word is paraphrased with a noun (e.g. unsure about the reason why… above).