1

2nd conditional:

I would leave if I could.

3rd conditional:

I would have left if I could --the same form of "could"

but

I would have left if I could have used the car.

Is that correct? Is the first example of 3rd conditional correct, i.e. using the same form of the modal as the second conditional?

  • 1
    Using the past simple tense instead of the past perfect in the 3rd conditional is acceptable in colloquial English where the grammar is usually mixed up. See here on ELL and here for the "could" issue. – Tasneem ZH Feb 28 '19 at 18:01
  • @TasneemZh Then how would you say the second sentence -I would have left if I could have ? – John V Feb 28 '19 at 18:05
  • Change it to I would have left if I had been able to. – Tasneem ZH Feb 28 '19 at 18:08
-1

2nd conditional sentence is structured like this:

If + Subject + Verb(past), Subject + would + V(inf)

3rd conditional sentence is structured like this:

If + Subject + had + past participle, Subject + would/could/might + have + past participle

So look at your question, the sentence you are confused is grammatically correct with 3rd conditional sentence's structure.

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