Well, gee. You can do alot of things.
Kill them
Spawn them
PLay with them
Spy on them
Trap their doorway then spy on them
Steal items form their chests
And so on!
The Possibilities are endless!
No, villagers do not eat.
Villagers aren't available on Minecraft P.E. yet.
There are villagers in the full version of Minecraft and the Minecraft demo. However there are no villagers in the Classic version of Minecraft, but it is possible for a server to create AI controlled entities (which mostly just stand there).
u cannot breed villagers
Not yet
Villagers are never hostile towards you, unless they are zombies or you have a mod that causes villagers to attack you
because emeralds were added to be able to trade with the villagers
Not yet
No. That is impossible.
You cant unfortunately but there maybe a mod out there.
They do not directly turn into zombies, but they turn into zombie villagers. Zombie villagers can be cured using golden apples and potions of weaknesses.
Yes i did i got 10 diamods for 3 emeralds in minecraft 1.3.1