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The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences. [1] The term is used particularly in the context of English grammar to refer to forms like "I have finished".
The perfect passive is usually made with the perfect participle combined with sum, e.g. missus sum 'I was sent, I have been sent', ductus sum 'I was led, I have been led'. Some perfect tenses have an irregular stem, for example sum, fuī 'I am', eō, īvī 'I go', ferō, tulī 'I bring, I bear', tollō, sustulī 'I raise, I remove'.
The present perfect may also be used with future reference, instead of the future perfect, in those dependent clauses where future occurrence is denoted by present tense (see § Dependent clauses below). For example: When you have written it, show it to me. For the possibility of a present perfect subjunctive, see English subjunctive.
An auxiliary verb (abbreviated aux) is a verb that adds functional or grammatical meaning to the clause in which it occurs, so as to express tense, aspect, modality, voice, emphasis, etc. Auxiliary verbs usually accompany an infinitive verb or a participle, which respectively provide the main semantic content of the clause. [1]
Three of these are based on the present stem (e.g. dūc-) and three on the perfect stem (e.g. dūx-). In addition, there are four tenses in the subjunctive mood, and two in the imperative. Further tenses can be made periphrastically by combining participles with the verbs sum "I am" or habeō "I have", for example ductūrus eram "I was going to ...
English has an active participle, also called a present participle; and a passive participle, also called a past participle. The active participle of break is breaking, and the passive participle is broken. Other languages have attributive verb forms with tense and aspect.
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.
The English passive voice typically involves forms of the verbs to be or to get followed by a passive participle as the subject complement—sometimes referred to as a passive verb. [ 1 ] English allows a number of additional passive constructions that are not possible in many other languages with analogous passive formations to the above.