When we speak, we normally join words together (apart from in very formal speech).
I am going out -> I’m going out
There are two types of contraction: Noun/Pronoun/etc. + (auxiliary) verb
I’m looking forward to seeing you. Do you know when you’ll arrive? Here’s the train.
Where’s the nearest pub? There’s a problem.
(auxiliary) verb + not
I don’t want to go. Aren’t you coming?
We can’t arrive before 7.
They won’t want to eat here. Shouldn’t you see him?
Note: Negative contractions can come at the ends of clauses They really aren’t.
No, I haven’t.
Other contractions cannot: A. I’m late.
B. Yes, you are. Yes, you’re A. I’ve forgotten. B. Yes, you have. Yes, you’ve
Sometimes you have a choice about which contraction to make: We have not gone home -> We haven’t gone home OR We’ve not gone home He will not go home -> He won’t go home OR He’ll not go home
The contractions with n’t are more common in Standard British English. Double contractions like we’ven’t and he’lln’t are incorrect.