third conditional

If I'd known his number, I would have called him.

This sentence is:

• a real situation in the present

• a real situation in the past

• an imaginary/hypothetical situation in the present

• an imaginary/hypothetical situation in the past

If I'd known his number, I would have called him.

What is a correct conclusion about this sentence?

• I didn't know his number, so I didn't call him

• I don't know his number, so I won't call him

• I knew his number but I didn't call him

If I hadn't gone to university, I wouldn't have met my wife.

What is a correct conclusion about this sentence?

• I didn't go to university, so I met my wife somewhere else.

• I went to university and met my wife there.

• I went to university but met my wife somewhere else.

If I hadn't skipped so many classes, I would've obtained a degree with distinction.

What is a correct conclusion about this sentence?

• I skipped a lot of classes but obtained a degree with distinction anyway

• I didn't skip many classes but didn't obtain a degree with distinction

• I skipped many classes so I didn't obtain a degree with distinction

• I didn't skip many classes and obtained a degree with distinction

Which sentence is grammatically correct?

• They would have been much happier if they never married.

• They had been much happier if they have never married.

• They would have been much happier if they had never married.

• They would had been much happier if they had never married.

Which sentence is grammatically correct?

• What we would have done if we had missed the flight?

• What would we have done if we had missed the flight?

• What had we done if we would have missed the flight?

• What would we have done if we would have missed the flight?

If I'd left earlier, I'd have caught my flight.

In this sentence, where's had and where's would?

• I'd left = I would left, I'd have caught = I had have caught

• I'd left = I had left, I'd have caught = I would have caught