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The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect is used. For example: I have written a letter this morning. (if it is still the morning) He has produced ten plays.
The Sentence in Written English: A Syntactic Study Based on an Analysis of Scientific Texts. Cambridge University Press. p. 352. ISBN 978-0-521-11395-3. Jespersen, Otto (1982). Growth and Structure of the English Language. Chicago and London: University of Chicago Press. p. 244. ISBN 0-226-39877-3. Jespersen, Otto (1992). Philosophy of Grammar.
Each row corresponds to a change in log (time before present) (that is, the logarithm of the time before the present) of about 0.1 (using base 10 logarithms). The dividing points are taken from the R′′20 Renard numbers. Thus each row represents about 21% of the time from its beginning until the present.
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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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".
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It is the first time Israeli troops would be stationed in the buffer zone since a 1974 agreement establishing the line of control between Israel and Syria, though they have in the past entered the ...
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