It

Subject Pronoun

Referential

• It seems to be injured. (animal)
• It looks broken. (machine)
• It comes from Thailand. (thing)

Dummy pronoun

pronom impersonnel

It's raining nuts and squirrels.

Limit cases

It's hard, isn't it?

Object pronoun

• Read it! (it = text)
• Watch it! (it = movie / your behavior)