يغادر المكان

No, it's better to use 'taraka' (ترك) for people. 'Yughadir' is for physical locations.

Rarely. It's mostly Modern Standard Arabic (MSA). In dialects, people use 'mishi', 'raah', or 'falla'.

The past tense is 'ghādara' (غادر). Example: 'Ghādara al-makan' (He left the place).

No, you can replace 'al-makan' with any specific place, like 'yughadir al-ghurfa' (leaves the room).

The correct transliteration is 'yughādir' with an 'i' sound in the last syllable.

Form III often indicates an action that is directed or interactive. In this case, it's a formal way to describe departing.

Yes, that is very common in news reports about travel or politics.

The noun (masdar) is 'mughādara' (مغادرة), which means 'departure'.

It's not rude, but it's very formal. It's like texting 'I am departing the premises' instead of 'I'm leaving'.

Not necessarily. It just describes the act of exiting at that moment.

You say 'Urīdu an ughādira al-makān'.

Yes, you can say 'the bird left the nest' using this verb.

'Kharaja' is 'to go out' (requires 'min'), while 'yughadir' is 'to depart' (transitive).

Yes, 'yughadir al-shughl' is possible, but 'yutruk al-shughl' is more common for quitting.