Yes he does, but only Imperio and Crucio not the Avada Kadavra.
There are none.
she was hit with none she sent them and Snape blocked them.
It is unknown.
You have to throw different curses at the death eaters
It is unknown.
Harry Potter has used two unforgivable curses. In the Order of the Phoenix he used the Cruciatus curse on Bellatrix Lestrange, then in the Deathly Hallows he used the Imperius curse to break into Gringotts.
Tbh don't no But probs not many cos the gud guys didn't use killing curses
Potentially he's powerful and hates LV enough to do it but Harry won't the so called "love" and his intrinsic goodness means he'd probably never cast an unforgivable in an all out duel but if he was wound up enough he probably could. Unforgivable curses need serious intent to harm to cast that's why Harry couldn't torture Bellatrix properly in OOtP which i always thaught was odd considering he could torture someone for spitting at his head of house. He regularly uses Imperio in DH. So no there's no real reason why he couldn't but if he's using AK unless the story is AU in some way it might not work on LV who has horcruxes etc.etc
There were several ways that people died in Harry Potter and the Deathly Hallows. It had the highest death rate out of the series. Some methods included being eaten by a snake, forbidden curses, being crushed, and a few others.
Lets see: Petrificus Totalus; Stupify; Crucio; Avadra Cadavra; Imperio. The last 3 are the 3 unforgivable curses.
Avada Kedavra. The spell is avada kedevra and it emits a green flash of light form the wand which kills instantly
The three unforgivable cures are: Avada Kedavra which is pronounced a-VAH-dah ke-DAH-vra. Imperio which is pronounced im-PEER-ee-oh. Crucio which is pronounced KROO-see-oh.