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Non-finite verb groups: infinitives and participles

R124 A non-finite verb group is an infinitive, a participle, or a verb group beginning with a participle. It cannot be combined with a subject to form a sentence.

Non-finite verb groups are used after verbs in phase structures (see paragraphs 3.193 to 3.213) and are also used in non-finite subordinate clauses (see the section on subordination in Chapter 8). They are also used in some structures with impersonal 'it' (see paragraphs 10.39 to 10.41).

'To'-infinitives are also used after some nouns and adjectives (see paragraphs 2.310 to 2.316, and 2.55 to 2.66). Present participles are also used as the objects of prepositions.

Non-finite verb groups can have objects, complements, or adjuncts after them, just like finite verb groups. A clause beginning with a 'to'-infinitives is called a 'to'-infinitive clause, a clause beginning with a present participle is called a present participle clause, and a clause beginning with a past participle is called a past participle clause.

R125 The order of auxiliaries is the same for non-finite verb groups as for finite verb groups (see paragraph R89). Note that modals are never used in non-finite verb groups.

R126 The active 'to'-infinitive consists of 'to' and the base form of the verb. This sometimes called the present infinitive or simply the infinitive.

I want to escape from here.

I asked Don Card to go with me.

R127 The active infinitive without 'to' consists of the base form of the verb. It is sometimes called the bare infinitive.

They helped me get settled here.

R128 Other active infinitive forms are occasionally used.

The present continuous infinitive consists of 'to be' or 'be', followed by the present participle.

It is much better for young children to be living at home.

The perfect or past infinitive consists of 'to have' or 'have', followed by the past participle.

Only two are known to have detected.

The perfect or past continuous infinitive consists of 'to have been' or 'have been', followed by the present participle

I seem to have been eating all evening.

R129 There are also passive infinitives. The ordinary passive infinitive consists of 'to be' or 'be', followed by the past participle.

I didn't want to be caught off guard.

The perfect or past passive infinitive consists of 'to have been' or 'have been', followed by the past participle.

He seems to have been completely forgotten.

R130 The table below gives a summary of infinitives. The passive infinitives marked with a star are very rarely used.

active

passive

present continuous

perfect

perfect continuous

(to) eat

(to) be eating

(to) have eaten

(to) have been eating

(to) be eaten

(to) be being eaten*

(to) have been eaten

(to) have been being eaten*

R131 The present participle is used as a non-finite verb group, usually with an active meaning.

'You could play me a tune,' said Simon, sitting down.

He could keep in touch with me by writing letters.

R132 Combinations beginning with 'having' are occasionally used.

The perfect or past 'ing' form consists of 'having' and the past participle.

Ash, having forgotten his fear, had become bored and restless.

The perfect or past continuous 'ing' form consists of 'having been' and the present participle. It is rarely used.

Having been supporting Tom and Mick on the climb for a week, they needed a rest.

R133 There are also combinations beginning with 'being' and 'having' which have a passive meaning.

The ordinary passive 'ing' form consists of 'being' and the past participle.

...fears that patients would resent being interviewed by a medical computer.

The perfect or past 'ing' form consists of 'having been' and the past participle.

Having been declared insane, he was confined for four months in a prison hospital.

Some were shot full of arrows after having been mortally wounded by gunshot.

R134 The table below gives a summary of 'ing' forms. The '-ing' form marked with a star is very rarely used.

active

passive

perfect

perfect continuous

eating

having eaten

having been eating

being eaten

having been eaten

having been being eaten*

R135 The past participle is also used as a non-finite verb group, with a passive meaning.

Stunned by the swiftness of the assault, the enemy were overwhelmed.

When challenged, she started and seemed quite surprised.

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