How do you identify present perfect tense?

Present perfect has this form - have/has + past participle.

For most verbs the past participle is the same as the past form - verb + -ed eg walked, talked, listened.

For some verbs (irregular verbs ) the past participle has the same or a different form eg

run - run, eat - eaten, see - seen, do - done.

Have is used with plural subjects (and I), has is used with singular subjects.

Some examples of present perfect:

We have been to China. He has eaten the cake. The dog has buried his bone.

The police have made an arrest. The doctors have finished the examination.