third conditional - if+past perf+would have+past participle
If you ________ (not/be) late, we _________(not/miss) the bus.
If you hadn't been late we wouldn't have missed the bus.
If she _______ (study) she _________ (pass) the exam.
If she had studied she would have passed the exam.
If we ________ (arrive) earlier, we _________ (see) John.
If we had arrived earlier we would have seen John.