how to use "unless" the proper way

How to use "Unless" and "If"Unless simply means"if ... not". We use it for negative conditions.
Unless is used to say that a specific action or situation will happen only if another action happens before.
We use a positive verb after unless, but the meaning is negative:
I won't go unless you go. = I won't go if you don't go
He won't sleep unless you tell him a story. = He won't sleep if you don't tell him a story.
They can’t pass the exam unless they study. = They can’t pass the exam if they don't study.
Unless you are a member, you can't go in. =If you are not a member, you can't go in.
Unless he has a passport, he can't go abroad. =If he doesn't have a passport, he can't go abroad.
I won't go to the party unless I am invited. = I won't go to the party if Iam not invited.
We'll go swimming unless it's cold. = We'll go swimming fit's not cold.
Type 1: (Unless + present)
*.Unless you leave now, you will be late.
*.You can't get a good job unless you've got experience.
Type 2: (Unless + past)
*.Unless I were sick, I would be at work.
*.I wouldn't go there unless I had enough money.
Type 3: (Unless + past perfect)
*.She would have come with us if she hadn't been so ill.
*.The thieves would have killed her unless she'd given them the money.