Usage examples "infinitive":
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If we wish to speak of something relating to a time prior to that indicated in the past tense we must use the perfect tense of the infinitive;
as, " He appeared to have seen better days." - "How to Speak and Write Correctly",
Joseph Devlin.
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The Infinitive
mood is that form of the verb, which expresses the being, action, or passion, in an unlimited manner, and without person or number: as, To die,- to sleep;- To sleep! - "The Grammar of English Grammars",
Goold Brown.
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The infinitive,
in fact, is governed by the preposition to; and the preceding verb, if it has no other object, is intransitive. - "The Grammar of English Grammars",
Goold Brown.