If conditionals: third, mixed

Third Conditionals are sentences with two clauses – an ‘if' clause and a main clause – that describe the past. They are used to describe ‘something that didn’t happen’.
We would have arrived on time if we had left earlier.
We left late so we arrived late.
In mixed conditionals, the time between the first and second clause is not the same.
We would be there now if we had left earlier.
We are not there now because we left late.