Present Perfec Simple

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PRESENT PERFECT SIMPLE

The present perfect is used in English to narrate events that have occurred at atime, specific or not, in the past but still have a relevance to the present, can be used in the affirmative, negative and interrogative serves as an assistant in the English language if we want torefer to actions that have already occurred at a time, specific or not.
this essay will expose the use and structures of present perfect simple and the use of simple past use combination timesexpression according to the content of the book let's speed up 4

The present perfect simple, as already mentioned is an auxiliary to indicate times in English as all actions have a fairly simple structureand easy but as we know that you are using it, only we must first know the structure or form of this compound as the auxiliary of the English language below is the structure:

Subject + auxiliary +times expression + past participle verb + complement
If it decomposes in each of the components of the structure we find the following:
used for subject I, you, we, They, he, she, it, used in theauxiliary have / has, have for i, you, we, They and he, she, it has used, in the time expression used ever, never, before, always, just, so far, once, twice, etc., in the past participle verb issimple since it is used as the name indicates the past participle of verbs to use, and the complement can be defined as to complete and make sense of the sentence.
But the difference between past simpleand present simple?

The difference is not much longer than in the simple past:
Examples:
-Action to be developed and finalized in the past, without any information about what has been its impactin the present.
-When I was young I played tennis
- Action to be developed and completed in a period of time and complete.
-This morning I had a very tense meeting with my boss

And the present...