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The form without to is called the bare infinitive; the form introduced by to is called the full infinitive or to-infinitive. The other non-finite verb forms in English are the gerund or present participle (the -ing form), and the past participle – these are not considered infinitives.
The simple past or past simple, sometimes also called the preterite, consists of the bare past tense of the verb (ending in -ed for regular verbs, and formed in various ways for irregular ones, with the following spelling rules for regular verbs: verbs ending in -e add only –d to the end (e.g. live – lived, not *liveed), verbs ending in -y ...
The base form or plain form of an English verb is not marked by any inflectional ending.. Certain derivational suffixes are frequently used to form verbs, such as -en (sharpen), -ate (formulate), -fy (electrify), and -ise/ize (realise/realize), but verbs with those suffixes are nonetheless considered to be base-form verbs.
For the uses of these various verb forms, see English verbs and English clause syntax. The basic form of the verb (be, write, play) is used as the infinitive, although there is also a "to-infinitive" (to be, to write, to play) used in many syntactical constructions.
In English, the ACI construction occurs more so than other European languages, normally with verbs of wishing, saying and perceiving, as well as in causative clauses. Depending on the valency of the main verb in the sentence, English may use the infinitive with or without the infinitive marker to. I would like the President to be successful.
In Modern English, this type of modality is expressed via a periphrastic construction, with the form would + infinitive, (for example, I would buy), and thus is a mood only in the broad sense and not in the more common narrow sense of the term "mood" requiring morphological changes in the verb.
In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...
These verbs are called "catenative" because of their ability to form chains in catenative constructions. For example: We need to go to the tennis court to help Jim to get some practice before the game. "Need" is used here as a catenative verb followed by the infinitive "to go", and "help" is a catenative verb followed by the infinitive "to get ...
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