To make the present perfect,we use:

 have/has + past participle . 

the past participle : we have two kinds of verbs : regular and irregular verbs . 

1.Regular verbs: verb+ed  

ex : work --> worked , ask --> asked , try --> tried  

2.Irregular verbs: look at the list of irregular verbs 3rd column 

ex : speak --> spoken , go --> gone , buy --> bought  

Beginners
English exercise "Present perfect" created by bridg (14-10-2007) with The test builder
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1. I (to forget) my book at home.
2. He (to lose) his keys.
3. She (not/see) her son for a long time.
4. I (not/revise) my lessons.
5. Thomas (to work) very hard.
6. The child (to break) a cup.
7. Fati (not/call) me since Wednesday.
8. The children (not/eat) anything.
9. Emilio (not/speak) to the boss.
10. They (to go) to the cinema.