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(Passive voice can also be marked in nonfinite constructions – with infinitives, gerunds and present participles – in the expected way: (to) be eaten, being eaten, having been eaten, etc.) Examples of nonfinite constructions marked for the various aspects are given below. Bare infinitive: You should have left earlier.
An -ing form is termed gerund when it behaves as a verb within a clause (so that it may be modified by an adverb or have an object); but the resulting clause as a whole (sometimes consisting of only one word, the gerund itself) functions as a noun within the larger sentence. For example, consider the sentence "Eating this cake is easy."
The understood subject of the gerunds in these sentence is non-discriminate; any generic person will do. In such cases, control is said to be "arbitrary". Any time the understood subject of a given predicate is not present in the linguistic or situational context, a generic subject (e.g. 'one') is understood.
For example, from the base form exist, all the inflected forms of the verb (exist, exists, existed, existing) can be predictably derived. The base form is also called the bare infinitive; that is, the infinitive without the to. Most irregular verbs have three principal parts, since the simple past and past participle are unpredictable.
A gerund is a verb form that appears in positions that are usually reserved for nouns. In English, a gerund has the same form as a progressive active participle and so ends in -ing. Gerunds typically appear as subject or object noun phrases or even as the object of a preposition:
Each of the gerunds in the a-sentences (stopping, attempting, and cheating) constitutes a non-finite clause. The subject-predicate relationship that has long been taken as the defining trait of clauses is fully present in the a-sentences. The fact that the b-sentences are also acceptable illustrates the enigmatic behavior of gerunds.
The other inflected parts of the verb – the third person singular present indicative in -[e]s, and the present participle and gerund form in -ing – are formed regularly in most cases. There are a few exceptions: the verb be has irregular forms throughout the present tense; the verbs have , do , and say have irregular -[e]s forms; and ...
A non-finite clause is similar, except that the verb must be in a non-finite form (such as an infinitive, participle, gerund or gerundive), and it is consequently much more likely that there will be no subject expressed, i.e. that the clause will consist of a (non-finite) verb phrase on its own. Some examples are given below. Finite clauses