Presente Y Pasado Perfecto

Past Perfect
The Past Perfect in English is a tense that is used to refer to an action that took place at a time before another action, although both have happened in the past by establishing anorder between them, for example:
The film had finished When She arrived at the cinema.
(First action: the movie was over
Second action: she came to the cinema)

When Sarah had prepared dinner herhusband got home.

(First action: Sarah had prepared dinner
Second action: her husband arrived home)

To build the affirmative form of the Past Perfect we use as an auxiliary verb to have in thePast Simple and accompanied by the main verb in its past participle (either regular or irregular verbs verbs):
I had bought a new car.
You had cleaned the house.
Brought the gifts I had.
She hadlost the credit card.

To form a question we put the auxiliary at the beginning of the sentence, then the subject and then the main verb in past participle also:
Had I bought a new car?
Had youcleaned the house?
Had I Brought the gifts?
Had she lost the credit card?

Meanwhile, the negative is constructed by placing the negation NOTentre the auxiliary and the main verb, for example:
I hadnot bought a new dress.
You had not cleaned the house.
I had not Brought the gifts.
She had not lost the credit card.

You can also use the contracted form of denial rather colocandoHADN'T HADNOT.

Present Perfect
The Present Perfect in English is a tense that is used to refer to actions that happen in the recent past and that have some connection with this. Its equivalent in Spanish isthe Present Perfect:
I have sent the letter.
I have sent the letter.
(Indicates that the action just happened)

To build the affirmative form of the Present Perfectodebemos used as auxiliary verbto have in the Simple Present and accompanied by the main verb in its past participle (either regular or irregular verbs verbs):
I have bought a new dress.
You have Studied the lesson.
He has...