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No particular past time frame is specified for the action/event. When a past time frame (a point of time in the past, or period of time which ended in the past) is specified for the event, explicitly or implicitly, the simple past is used rather than the present perfect. The tense may be said to be a sort of mixture of present and past.
For past actions or states, the simple past is generally used: He went out an hour ago; Columbus knew the shape of the world. However, for completed actions for which no past time frame is implied or expressed, the present perfect is normally used: I have made the dinner (i.e. the dinner is now ready).
The present tense used in the condition clause may take the form of the simple present as in the above examples, or the present progressive, present perfect or present perfect progressive as appropriate (according to general principles for uses of English verb forms): If he is sleeping when we arrive, we shan't wake him. (present progressive)
simple conditions (factual or logical implications) present tense [if present indicative then indicative] sī valēs, gaudeo "if you are well, I am glad" past tense [if perfect indicative then indicative] sī peccāvī, īnsciēns fēcī "if I did wrong, I did so unwittingly" 2nd person generalisations [if present or perfect subjunctive then ...
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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
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