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

• exercise 1: multiple choice met its of it’s
• exercise 2: multiple choice met its of it’s
• exercise 3: multiple choice met its of it’s
• exercise 4: multiple choice met its of it’s
• exercise 5: multiple choice met its of it’s
• exercise 6: multiple choice met its of it’s
• exercise 7: multiple choice met its of it’s
• exercise 8: multiple choice met its of it’s
• exercise 9: multiple choice met its of it’s
• exercise 10: multiple choice met its of it’s

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