Present perfect

 Afirmative.

Have.

I have+Participle past or verb ed/We have+Participle past or verb ed/You Have +Participle past or verb ed/They have+Participle past or verb ed

Has.

She has+Participle past or verb ed/He has+Participle past or verb ed/It has+Participle past or verb ed

Negative.

Have.

I have not +Participle past or verb ed/We have not+Participle past or verb ed/You Have not +Participle past or verb ed/They have not +Participle past or verb ed

I haven`t +Participle past or verb ed/We haven`t +Participle past or verb ed/You Haven´t +Participle past or verb ed/They haven`t +Participle past or verb ed/

Has.

She has not+Participle past or verb ed/He has not+Participle past or verb ed/It has not+Participle past or verb ed/

She hasn´t +Participle past or verb ed/He hasn´t +Participle past or verb ed/It hasn´t +Participle past or verb ed

Interrogative.

Have.

Have I+Participle past or verb ed/Have We+Participle past or verb ed/ Have You +Participle past or verb ed/Have They+Participle past or verb ed

Has.

Has She+Participle past or verb ed/Has He+Participle past or verb ed/Has It+Participle past or verb ed

Use.

Point out actions or  events that happened in the past thense, but are still relevant in the present 

Irregular verbs.

There are irregular vervs that have specific past participle forms