We form the present perfect simple with have/has and the past participle of the verb. 
(pro)noun + have, has + past participle

We use present perfect for: 

1. Actions which started in the past and still continue in the present: 
He has worked as a doctor since 1990. 

2. Actions which have recently finished and their results are still visible: 
I have broken my arm. 

3. Experiences: 
He has tried rock climbing. 

4. Actions which happened at an unspecified time in the past. The exact time is not mentioned: 
Adam has bought a new mobile phone. 

Affirmative: (pro)noun + have, has + past participle
I have finished my homework.

Negative: (pro)noun + have, has + not + past participle
I haven't finished my homework.

Interrogative: Have, has + (pro)noun + past participle
Have you finished my homework.

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