Thanks again, Dirk - and Isabella! You're further explanation makes the rules very clear. It helps a lot.

Thanks so much for the very detailed explanation. (I think!) It's a bit overwhelming, so I'll have to go over it several times to let it sink in. I really appreciate the time and effort you put into this. Grazie mille!

In Italian level 4, lesson 8, "Write the phrase you hear", an answer is given as "Vi sentite stanche perche; avete dovuto trasferirvi subito."
The next answer is given as "Vi sentite molto stanche perche; vi siete dovute trasferire qui subito." Because reflexive verbs take essere, I assume the second one is correct. Or does the first phrase take stare because the pronoun is attached to the end of the verb instead of before it? If so, does this apply to all reflexive verb phrases configured this way? Thanks