Learn Italian: Se fossi coordinato, non saresti caduto. - If you were coordinated, you wouldn't have fallen.

This is a mixed conditional. It mixes a present or ongoing condition with a past result. Se fossi coordinato means 'If you were a coordinated person in general' (an ongoing trait, so we use the imperfect subjunctive). But the consequence, non saresti caduto ('you wouldn't have fallen'), already happened in the past, so it requires the past conditional.

Why does cadere take essere as its helper verb in saresti caduto, and what happens if I say this to a woman?

Intransitive verbs of motion, like cadere (to fall), always use essere as their auxiliary verb in compound tenses. When you use essere, the past participle must agree with the subject's gender and number. If you were speaking to a woman, both the adjective and the participle would change to the feminine form: Se fossi coordinata, non saresti caduta.

How would the meaning change if I said Se fossi stato coordinato instead of Se fossi coordinato?

If you used the past perfect subjunctive (fossi stato), it would mean 'If you had been coordinated' just in that specific past moment, rather than referring to a general, ongoing personality trait. That would make it a standard Type 3 conditional where both the condition and the result are entirely in the past.

Since the imperfect subjunctive form fossi is exactly the same for io, , and , how do we know it means 'you' here?