A contraction is a shortened version of the written and spoken forms of a word, syllable, or word group, created by omission of internal letters and sounds. (wikipedia)
Here is Contraction List in English – From A to Izzard;
Are not       –                                                                                                           Aren’t
Can not – Can’t
Could not – Could’t
Did not – Didn’t
Does not – Doesn’t
Do not – Don’t
Had not – Hadn’t
Has not – Hasn’t
Have not – Haven’t
He had – He’d
He would – He’d
He will – He’ll
He shall – He’ll
He is – He’s
He has – He’s
I had – I’d
I would – I’d
I will – I’II
I shall – I’ll
I am – I’m
I have – I’ve
Is not – Isn’t
Let us – Let’s
Might not – Mightn’t
Must not – Mustn’t
Shall not – Shan’t
She had – She’d
She would – She’d
She will – She’ll
She shall – She’ll
She is – She’s
She has – She’s
Should not – Shouldn’t
That is – That’s
That has – That’s
There is – There’s
They had – They’d
They would – They’d
They will – They’ll
They are – They’re
They have – They’ve
We had – We’d
We would – We’d
We are – We’re
We have – We’ve
Were not – Weren’t
What will – What’ll
What shall – What’ll
What are – What’re
What is – What’s
what has – What’s
What have – What’ve
Where is – Where’s
Where has – Where’s
Who had – Who’d
Who would – Who’d
Who will – Who’ll
Who shall – Who’ll
Who are – Who’re
Who is – Who’s
You are – You’re
You will – You’ll
You have – You’ve