Present Perfect	An action or situation that started in the past and continues in the present. I have lived in Bristol since 1984 (= and I still do.) An action performed during a period that has not yet finished. She has been to the cinema twice this week (= and the week isn't over yet.) A repeated action in an unspecified period between the past and now. We have visited Portugal several times. An action that was completed in the very recent past, expressed by 'just'. I have just finished my work. An action when the time is not important. He has read 'War and Peace'. (= the result of his reading is important)
present perfect structure
simple past	The simple past tense is used to describe a completed activity that happened in the past. In other words, it started in the past and ended in the past. Normally it has the time when was done
should used to expresse something was expected in the past but didn't happen.	should + have + past participle	I should have called Fany but ai forgot

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