Помогите пожалуйста(заблаговременно спасибо) 2. Перефразируйте предложения используя Perfect Infinitive (дивись

a) 1. They could help him but they didnt do it. - They could have helped him.
2. She could pass her examination in chemistry but she failed. - She could have passed her examination in chemistry.
3. She could buy this book but she didnt buy it. - She could have bought this book.
4. Our football players could win the match but they lost it. - Our football players could have won the match.
5. I could learn the poem by heart but I had no time for it. - I could have learned the poem by heart.
b) 1. He nearly broke the window. - He might have broken the window.
2. I nearly forgot about it. - I might have forgotten about it.
3. She nearly fell asleep. - She might have fallen asleep.
4. The news nearly killed him. - The news might have killed him.
5. I nearly caught cold. - I might have caught cold.
c) 1. Im sure you saw the performance last year. - You must have seen the performance last year.
2. Evidently his daughter has finished the secondary school. - His daughter must have finished the secondary school.
3. Im sure he has fallen ill. - He must have fallen ill.
4. Evidently I have lost my pen. - I must have lost my pen.
5. Im sure she has left the book at home. - She must have left the book at home.