Apostrophes

-What are the 2 times to use an apostrophe?

In contractions e.g.(can't) and when explaining something belongs to something e.g. ( Hamish's bike)

- When should you use an apostrophe of possession?

When explaining that  something belongs to something e.g. ( Hamish's bike)

- Where does it go in a sentence?

I can't go to the dance.

What are you doing? That's Derek's.

Sorry we're going to the movies.

- When should you NOT use an apostrophe of possession?

When someones name ends with an "s" when its not explaining an object the belongs to that person.

- When should you use an apostrophe of contraction?

When you are using contractions e.g. (can't, he's)

- Why do we use apostrophe of contractions?

To show where the second words missing letters are supposed to be

- Where does the apostrophe of contraction go in a contracted word?

where the second words missing letters are supposed to be 

-can't  n't

-I'd     i'd

-we're e'r