Theory:

The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences.
We form the Present Perfect with
have/has  + the past participle form of the verb (3rd form of the verb).

S +  have / has + V3 + O
S - subject: I, we, you, they, he, she, it, Mary, John ...
V3 - The Past Participle Of The Verb (The Verb In The Third Form): written, eaten, worked, ...
O - object
Example:
1. I have travelled a lot.
2. He has travelled to Europe.
3. She has lost her pen.
4. They have studied for the exam.
5. You have made a beautiful painting.
6. I have finished my all exams.
7. They have made a plan for going out.
 
The regular past participles end in -ed.
Example:
1. work - worked
2. listen - listened
3. finish - finished
4. play - played
5. snow - snowed
6. rain - rained
7. travel - travelled
8. study - studied
With irregular verbs, however, the past forms can be same or different.
Example:
1. sing - sung
2. sink - sunk
3. sit - sat
4. sleep - slept
5. speak - spoken
6. spend - spent
7. write - written
8. lose - lost
Sentences with past perfect from the lesson "Jane Eyre":
  • You have no money.
  • You have been asleep ever so long.
  • Doctor has been and gone.
  • You have left your parents to come to school
  • All the girls here have lost either one or both parents.
  • I have given you answers enough for the present.
  • I have heard you are ill
  • She has received a letter from Mrs. Fairfax
  • You have brought your luggage with you
  • She has the brightest pupils
  • I have heard enough of your lies
  • Shall I have to meet her today
  • She has lost her parents