I was sick so I didn't go to work yesterday.
If I hadn't been sick, I would have gone to work yesterday.
I don't have money so I won't go on holiday this summer.
If I had money, I would go on holiday this summer.
I won't go for a walk with you because I'm exhausted.
If I wasn't exhausted, I would go for a walk with you.
My phone was dead so I couldn't call you.
If my phone hadn't been dead, I could have called you.
Jack is lazy so he can't find a job.
If Jack wasn't lazy, he could find a job.
It's raining so we won't go cycling.
If it wasn't raining, we would go cycling.
