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2. Present perfect - Wikipedia

   en.wikipedia.org/wiki/Present_perfect

   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".

3. Perfect (grammar) - Wikipedia

   en.wikipedia.org/wiki/Perfect_(grammar)

   The present perfect is often used also for completed events where English would use the simple past. For details see Italian grammar. Spanish uses haber ("have") as the auxiliary with all verbs. The "present perfect" form is called the pretérito perfecto and is used similarly to the English present

4. Uses of English verb forms - Wikipedia

   en.wikipedia.org/wiki/Uses_of_English_verb_forms

   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.

5. English grammar - Wikipedia

   en.wikipedia.org/wiki/English_grammar

   The first published English grammar was a Pamphlet for Grammar of 1586, written by William Bullokar with the stated goal of demonstrating that English was just as rule-based as Latin. Bullokar's grammar was faithfully modeled on William Lily's Latin grammar, Rudimenta Grammatices (1534), used in English schools at that time, having been ...

6. Present tense - Wikipedia

   en.wikipedia.org/wiki/Present_tense

   Simple present : The simple present tense is employed in a sentence to represent an action or event that takes place in the present regularly. Present perfect : The present perfect tense is utilized for events that begin in the past and continue to the moment of speaking, or to express the result of a past situation. [2]

7. Auxiliary verb - Wikipedia

   en.wikipedia.org/wiki/Auxiliary_verb

   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]