Adjectives can end in “-ing” or “-ed” just like participles, but they are very different
LINKS BETWEEN ADJECTIVES AND PARTICIPLES
Participles are verbs with -ing or -ed (or the irregular -ed equivalent used by some verbs after HAVE, such as taken, begun and put). They may be part of a verb phrase with HAVE or BE, or acting alone in an adjective-like way. It is this latter use that is the focus here.
The adjective-like nature of lone participles is useful for distinguishing them from verbal -ing and -ed words that are not participles. In particular, they distinguish participles from “gerunds” – lone -ing words that act like nouns rather than adjectives (see 71. Gerund and Participle Uses of “-ing”) – and of course from lone -ed words acting as verbs in the past simple tense.
Unfortunately, though, English has numerous -ing and -ed words that are full adjectives (see 304. Adjectives Made from a Verb, #3). The majority probably evolved from a participle use, though a few, like bearded and skilled, are made by adding -ed to a noun (see 291. Subtleties of “-ed”, #7). The existence of these adjectives means, of course, that the adjective-like properties of participles are no longer a distinguishing feature. This post is particularly concerned with ways in which lone participles differ from verb-derived -ing and -ed adjectives.
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DISTINGUISHING FEATURES OF “-ED” ADJECTIVES
1. Usability with a Causal Preposition Other than “by”
A lone -ed participle typically has passive meaning (see 291. Subtleties of “-ed”, #2), so that any mention of a causal noun is usually in a following by phrase. By contrast, after many (but not all) -ed adjectives, causal by is replaced by a different preposition:
(a) Anyone interested in today’s topic is invited to next week’s seminar.
Here, today’s topic is a cause or source of people being interested, and its placement after in instead of by shows an adjective use.
An -ed word that cannot be an adjective, such as helped, could only have by in (a). Interested too could have by, but only as a participle of the verb INTEREST. As such, interested would represent interest resulting directly from today’s topic. As an adjective, it represents a longer-standing interest. With -ed adjectives, this kind of meaning difference seems fairly typical.
Other -ed adjectives that show a cause with an alternative to by include amused (at), bored (with), concerned (about, with), confused (about), convinced (about), disappointed (about/with), disgusted (at/with), embarrassed (about, at), frightened (of), impressed (with), married (to), pleased (with), occupied (with), relaxed (about), relieved (at), satisfied (with), surprised (at), tired (of), used (to), worried (about) and upset (at/with).
Notice how these tend, like interested, to describe people. Many can introduce an abbreviated form of indirect speech (see 300. Adjective Indicators of Indirect Speech). Those with multiple alternatives to by may express different meanings with them (see 134. Words with a Variable Preposition). For more about married, see 201. Words with Complicated Grammar, #4.
It is important to keep in mind that the above guideline applies only to prepositions with causal meaning. Both adjectives and participles can accompany prepositions with other meanings, where non-use of by has no significance. This is the case, for example, with the participles acquainted (with), involved (in) and comprised (of). In fact, after acquainted and involved it would be possible to add a phrase with causal by alongside the phrase with the other preposition.
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2. Intransitivity of the Related Verb
The main problem with examining preposition usage to decide whether or not a particular -ed word is being used, or could be used, as an adjective is that the preposition will not always be known. An alternative approach that can on rare occasions indicate an -ed adjective is to consider whether the related verb can have an object (i.e. be “transitive”). If it can, adjective status will remain unclear, but if it cannot (i.e. is “intransitive”) then adjective status will be confirmed.
Compare, for example, used cars with grown men. We cannot tell with this test whether or not used is an adjective because the verb USE normally has an object – we must mention what is used after any active voice form. However, we can conclude that grown must be an adjective because GROW meaning “become mature” allows no object (see 113. Verbs that Cannot Be Passive). There is a logic here: -ed participles are usually passive; intransitive verbs cannot be passive; therefore, an -ed form of an intransitive verb must be an adjective.
However, not all intransitive verbs can become adjectives with -ed. Those that can tend to occur in common expressions like escaped prisoners, collapsed buildings, fallen heroes and grown men. Some are also usable in the ordinary passive form with BE (see 207. Exotic Grammar Structures 4, #1).
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3. Unexpected Meaning
Sometimes the adjective meaning of an -ed word differs more markedly from the participle one than is the case with interested. Examples are:
1 261. Words with Complicated Grammar 3, #2
2 261. Words with Complicated Grammar 3, #3
3 257. Structures with a Double Meaning 4, #5
4 35. Words Followed by “to -ing”
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4. Lack of a Related Ordinary Adjective
Some state-describing -ed verbs, such as opened, have a related adjective (open), while others, such as closed, do not. Related adjectives are recognisable as such through being usable without an ending after BE – an impossibility with verbs (see 140. Words with Unexpected Grammar 2, #f):
(b) Shops were open for business.
Close, by contrast, could not go in (b): it would have to be either closed or closing (although there is an adjective spelled the same as close – albeit pronounced differently – its meaning, similar to near, is unrelated). Other verbs with a related adjective include cleared (clear), filled (full), freed (free), narrowed (narrow), roughened (rough) and slowed (slow). Most of the adjectives, it will be seen, are spelled exactly as the base-form verb.
What I am proposing here is that -ed words like opened, which have a related adjective, are only participles, whereas -ed forms like closed can be either an adjective or a participle. This is because -ed words like opened cannot express the kind of meaning conveyed by adjectives like open whereas -ed words like closed can (see 66. Types of Passive Verb Meaning).
Consider again sentence (b). With were opened replacing were open, two interpretations are possible, both new. One is dynamic (a change from closed to open); the other is stative (no change). Although the adjective’s meaning is also stative, it is not the same: were opened suggests recent opening, whereas were open says nothing about when the opening happened. On the other hand, with were closed in (b), three interpretations are possible: the adjective one of “state that could be permanent” as well as the two that are possible with were opened.
Thus, to sum up, closed (and other state-describing -ed forms with no differently-spelt adjective) can be an adjective as well as a verb, whereas opened (and forms like it) cannot. Closed shops can correspond as well to open shops as to opened shops. Note that helped is not usually an adjective on this criterion because it does not usually describe a state.
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5. Special Pronunciation
In a few -ed adjectives, the ending has a different pronunciation from that of the related participle: /id/ instead of /t/ or /d/ (see 243. Pronunciation Secrets, #2). Example words are beloved, blessed, aged, dogged, learned, crooked, ragged, supposed.
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FEATURES TYPICAL OF “-ING” ADJECTIVES
6. Derivation from an Object-Needing Verb
If an -ing word is made from a verb that normally needs an object (see 8. Object-Dropping Errors), its usability after BE without an object will show it is an adjective. In the following sentence, this is the case with demanding:
(c) Hungry children can be demanding.
Here, demanding is an adjective because the sentence is grammatical despite the verb DEMAND being object-needing. Demanding would be part of an ordinary verb if a noun like food followed it. Its adjective meaning is “insistent”.
Other -ing adjectives that like demanding are made from an object-needing verb include alarming, amusing, becoming (= suiting), boring, calming, confusing, cutting, depressing, engaging, entertaining, fitting, flattering, frightening, fulfilling, heartening, inspiring, interesting, knowing, lasting, leading, off-putting, pleasing, pressing, promising, punishing, revealing, rewarding, saddening, satisfying, shocking, striking, surprising, taxing, testing, tiring and welcoming. More is available on knowing in 254. Tricky Word Contrasts 10, #5, and on satisfying in 114. Tricky Word Contrasts 3, #9.
However, not every -ing word made from an object-needing verb can be an adjective. Exceptions, recognizable from their need to have an object when they follow BE, include facilitating, involving and taking.
If an -ing word is made from one of the many English verbs that do not normally need an object, it seems much less likely to be usable as an adjective. For example, existing, falling, going, happening, increasing, remaining and rising are only participles. There are, however, some exceptions, such as gleaming, glistening, glowing, fluctuating and scheming. For a list of common verbs that cannot have an object, see 113. Verbs that Cannot Be Passive.
Note that there are also some -ing words, such as fleeting and uncomplaining, that are not directly derived from a verb and hence can only be adjectives.
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7. Ability to follow very
If an -ing word sounds natural after very, it is almost certainly an adjective. The reverse seems true too: not sounding natural after very probably indicates a participle.
In this respect, -ing adjectives differ from ordinary adjectives, which only allow very if they are “gradable” (expressing a quality that can exist in different amounts – see 194. Adverbs that Say How Much). A possibly non-gradable -ing adjective is revealing, but it easily allows very. Participles with -ing express the idea of very with much, e.g. much improving (see 98. “Very”, “Much” and “Very Much”).
With -ed words, very is not such a reliable adjective indicator, since it easily accompanies participles with by:
(d) The results were very affected by the weather.
Moreover, very cannot accompany non-gradable -ed adjectives like married.
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FEATURES OF BOTH ADJECTIVE TYPES
8. Inability to Directly Follow their Noun
Adjectives rarely follow their noun directly, but participles often can or must. Thus, if an -ing or -ed word seems possible or necessary after its noun, it is probably a participle. For example, obtained and applying typically follow their noun (the results obtained, the method applying) so must be participles.
Words usable both before and after their noun tend to keep the same meaning and to be participles as a result. An example is preferred. However, some change their meaning, becoming adjectives when used before. For example, the participle used in the car used just means “utilised”, but in used car becomes an adjective meaning “second-hand” (see 52. Participles Placed Just after their Noun, #6).
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9. Occurrence within a Hyphenated Word
Most hyphenated -ing and -ed words, e.g. law-breaking, all-encompassing, well-known and mixed-up, are adjectives. Exceptions are usually gerunds, not participles (see 223. Uses of Hyphens, #4, and the end of 106. Word-Like Suffixes).