the difference between its and it’s 

its is a possessive adjective indicating
that something belongs to it
(an object or an animal)
You should find that poor animal (= it) and put it out of its misery.
When the world (= it) turns its back on you, you turn your back on the world!
it’s is the contraction of either it is or it has  It’s (= it is) perfectly understandable, Charlotte”, my mother said
It’s (= it has) been going since 1990 when I was a junior in college.

exercises

useful pages

  • exercises for practising there, their and they’re
  • exercises for practising possessive pronouns (my/mine/of mine, your/yours/ of yours, etc.)
  • exercises for practising personal adjectives and pronouns (I/me, you, he/him, etc.)
  • exercises for practising am/is/are
  • exercises for practising has/have/had