The present perfect tense is formed using "has" or "have" plus the past participle to describe an action that occurred at an unspecified time before now or an action that started in the past and continues in the present. It can be used with unspecific expressions like ever, never, once, many times, before, and yet to talk about actions that happened at an unspecified time in the past or to describe past actions that have a present result or are ongoing.

3. • The present perfect is formed by combining
the auxiliary verb "has" or "have" with the
past participle.
I HAVE RECENTLY FINISHED MY HOMEWORK.
SHE HASN´T STUDIED FOR THE EXAM YET

4. • We use the Present Perfect to say that an action
happened at an unspecified time before now.
I have seen that movie twenty times.

5. • We CAN use the Present Perfect with
unspecific expressions such as: ever, never,
once, many times, several times, before, so
far, already, yet, etc.
I HAVE NEVER JUMPED FROM A BRIDGE

6. • We use to describe actions that happened in
the past with a result now
I have bought a car.

7. • We use to describe actions that happened in
the past and didn´t finished yet.
I have lived in this city since 1985.
I have played tennis since my childhood.