If he had left earlier, it wouldn't have got dark. О He left earlier.
О He didn't leave earlier.
О It got dark.

If I had known it was your birthday, I would have bought you a present.
О I knew it was your birthday.
Ο I didn't buy you a present.
Ο I didn't know it was your birthday.

If I hadn't studied hard at university, I would have such a good job.
Ο I worked hard at university.
Ο I have a good job.
Ο I don't have a good job.

If he had told someone where he was going, they would have looked for him.
Ο He didn't tell anyone where he was going.
Ο He told someone where he was going.
Ο They didn't look for him.

If I hadn't left my phone at home, I could call my boss.
Ο I left my phone at home.
Ο I can't call my boss.
Ο I didn't leave my phone at home.

If you had passed your driving test, you could give me a lift.
Ο You passed your driving test.
Ο You didn't pass your driving test.
Ο You can't give me a lift.

Explanation:

1.He didn't left earlier

2.I didn't know it was your birthday

3.I worked hard at the university

4.He didn't tell anyone where he was going

5.I left my phone at home

6.You didn't pass your driving test

the purpose of the heading in the passage is to identify who is telling the story.

this excerpt is part of the book sugar changed the world (2010) written by marc aronson and marina budhos. as the book has been written by two people, the heading "marc" indicates that this specific excerpt is being narrated by aronson. in the fragment, marc describes his grandfather's story after hearing it from his cousin. however, there are other excerpts where budhos is the one that tells the story of her family.

aronson and budhos, who are husband and wife in real life, decided to write sugar changed the world when they found out how sugar, which had an important role in slavery and economy, changed their ancestors' lives.