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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.
The English future perfect places the action relative only to the absolute future reference point, without specifying the location in time relative to the present. In most cases the action will be in the future relative to the present, but this is not necessarily the case: for example, "If it rains tomorrow, we will have worked in vain yesterday."
Notice that this includes use of the verb be in progressive aspect, which does not normally occur when be is used as a simple copula. Some examples: The food is being served. (present progressive passive) The stadium will have been built by next January. (future perfect passive) I would have got/gotten [32] injured if I had stayed in my place.
The same modal verbs are also often used with present rather than future reference. For details of their meanings and usage, see English modal verbs. Questions and negatives are formed from all of the above constructions in the regular manner: see Questions and Negation in the English grammar article.
[18]: p.76 The indicative mood has simple forms (one word, but conjugated by person and number) for the present tense, the imperfective aspect in the past tense, the perfective aspect in the past, and the future (and the future form can also be used to express present probability, as in the English "It will be raining now").
Present simple (not progressive, not perfect): "I eat" Present progressive (progressive, not perfect): "I am eating" Present perfect (not progressive, perfect): "I have eaten" Present perfect progressive (progressive, perfect): "I have been eating" (While many elementary discussions of English grammar classify the present perfect as a past ...
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
Planned events can also be referred to using the present progressive (She is arriving tomorrow) or, if precisely scheduled, the simple present (She arrives tomorrow). The future progressive and future perfect can be used analogously to the past equivalents: We will be sitting on the beach this afternoon; We will have left the house by 4 o'clock.