Its under the bed.
It`s under the bed.
Im happy to see you.
I'm (= I am)
My friends have all got new phones
No apostrophes - 'friends' and 'phones' are plural nouns
My friends phone is new. (one friend)
friend's phone (the phone belongs to my friend)
Thats Amys bag
That's = that is / Amy's bag = the bag belongs to Amy
There isnt a desk in my bedroom
There isnt - There isn`t
Theres the bedroom.
There's = there is
Those are the childrens shoes
children's - the shoes belong to the children
There arent any books.
There aren`t any books.
Lets go to the beach.
Let's = let us
Theres a plant.
There`s a plant.
Thats my parents house
That's = that is / my parents' house - the house belongs to my parents
He is 6 years old
No apostrophe - 'years' is a plural noun
My friends phones are all new (lots of friends)
friends' phones ( the phones belong to my friends) / no apostrophe 'phones' is a plural noun
Thats a good idea.
That's = that is
This shop sells clothes
No apostrophes - 'clothes' is a plural noun