the present perfect in a sentence

Examples

1. Note that unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence.
2. Thus these comments do not fall in the  as it happened timeframe, and I would suggest that for these the present perfect is more appropriate.
3. In most Iberian Mainland Spanish and, to a lesser extent, Mexican Spanish, there is still a strong distinction between the preterite and the present perfect.
4. In some forms of Spanish, such as the Rio Platense Spanish spoken in Argentina, the present perfect is rarely used : the simple past replaces it.
5. This is the past equivalent of the present perfect progressive, and is used to refer to an ongoing action that continued up to the past time of reference.
6. Instead, past tense is expressed using the present perfect, which is formed with auxiliaries'to be'and'to have'followed by the past participle.
7. As the preterite denotes an action that began and ended in the past, while the present perfect denotes an action that began in the past and is over, thus:
8. For reviewers comments, the present perfect and the present simple are both acceptable : " Jones has written . . . " or " Jones writes . . . ".
9. Past events are often referred to using the present perfect construction, as in " I have finished " ( also known as " present in past " ).
10. In addition, except in literature or very formal speeches, the present perfect form is used in modern French wherever the simple past would have been used in older or more literary writing.