its

belonging to it

• That dog just walked on its back legs.
• That store is having its back-to-school sale.
• My car has a mind of its own.

it's

it is

• Guess what? It’s my birthday!
• Do you know if it’s four o’clock yet?

it has

• It’s been driving me crazy.
• I think it’s taken the waiter twenty minutes to come back.

there

1. Most of the time, there means “at that place” (the opposite of "here").
   • I went there to meet my brother.
   • I found my wallet over there.
2. When placed at the beginning of a sentence, there often has little meaning other than "something exists."
   • There are ghosts in that haunted house.
   • There is an old house on the corner.

their 

belongs to them

• All of those kids with their contagious laughter really made my day.
• They didn’t want to see all of their hard work go to waste.

they’re

"they are" or "they were".

• They’re going to a party tomorrow.
• You should meet my work friends; they’re a real hoot.

your

belonging to you

• I like your shirt.
• Your cat is hiding under the couch.
• I think that pencil is yours.

you're

you + are

• You’re sitting on my coat.
• I think you’re ready for the next level.
• He told me you’re a piano player

Self Check

• Did you fix all your mistakes?