Помогите решить упражнение пожалуйста по английскому

Exercise 248. Combine the following couples of sentences
into one using the gerund.

A. Models: I am his pupil. I am proud of it. -- I am proud of
being his pupil.
I was his pupil. I am proud of it. -- I am proud of
having been his pupil.

1. He works with professor Collins. He is proud of it.
2. He worked with professor Collins. He is proud of it.
3. He is playing chess with a champion. He is proud of it.
4. He was playing chess with a champion. He is proud of it.
5. She made many mistakes. She is ashamed of it. 6. She
makes many mistakes. She is ashamed of it.

B. Models: I am often invited there. I am proud ofit. - I am
proud of being often invited there.
I was invited there. I am proud ofit. - I am proud
of having been invited there.
1. He is given an important task. He is proud of it. 2. He
was given an important task. He is proud of it. 3. She is
loved by the pupils. She is proud of it. 4. She was loved by
her pupils. She is proud of it. 5. The boy is praised by the
teacher. He is proud of it. 6. The boy was praised by his
teacher. He is proud of it.

C. Model: We sang together. We enjoyed it. -- We enjoyed
singing together.
1. I saw this film. I enjoyed it. 2. She played the piano.
She enjoyed it. 3. Tom collects stamps. He enjoys it. 4. The
boys played football. They enjoyed it. 5. We bathed in the
river. We enjoyed it.
D. Model: They went home. They did not wait for me. - They
went home without waiting for me.
1. I translate the text. I did not use the dictionary.
2. Mary left home. She did not lock the door. 3. He went to
bed. He did not take off his shirt. 4. The boy continued to
speak. He did not look at us. 5. The man saved the child. He
did not give his name.

E. Model: I did not take a taxi. I went there by bus. - Instead
of taking a taxi, I went there by bus.
1. We did not go to the seaside. We spent the summer in
the country. 2. He was not preparing for his exam. He was
playing chess. 3. I did not learn the story by heart. I prepared
to retell it. 4. I shall not go to the cinema. I shall watch
television. 5. I shan't write her a letter. I'll send her a telegram.

F. Model: Mother is busy. She is cooking dinner. -- Mother is
busy cooking dinner.
1. Tom is busy. He is repairing his bicycle. 2. Jane is
busy. She is washing her dress. 3. I was busy. I was preparing
my report. 4. The children are busy. They are cleaning the
room. 5. The teacher was busy. She was correcting our tests.

G. Model: This radio set is good. I advise you to buy it.
This radio set is worth buying.
1. This book is interesting. I advise you to read it.
2. This film is good. I advise you to see it. 3. This house is
not very old. I advise you to repair it. 4. This museum has
many interesting things. I advise you to visit it. 5. Many
scientific works are published in this language. I advise
you to learn it.