the present perfect in a sentence

Then, the present perfect continuous form is often used, if a continuing action is being described.
The Absolute Past may at all times be replaced with the Present Perfect ( but not vice versa ).
In Castilian Spanish, however, the present perfect is normal when talking about events that occur " today ".
In general, the present perfect occurs in cases where there is an explicitly or implicitly established present frame of reference.
:: : The present perfect is " not " used when an adverb of past time is also used.

Unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence.
In contrast to English and many other languages, Swedish does not use the perfect participle to form the present perfect and past perfect.
The implications of the present perfect ( that something occurred prior to the present moment ) are similar to those of the simple past.
In Vietnamese, the present perfect tense, past perfect tense are used as past tense, future perfect are used as future tense.
The construction is parallel to that of the present perfect ( there is no difference in French between perfect and non-perfect forms ).

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