She won't be angry if you tell her the truth. 
If I don't see you later, I will see you on Friday. 
You won't have time if you don't start now. 
If you tell me your secret, I won't tell anybody. 
If I don't write it down, I won't remember it. 
You won't pass if you don't study. 
If you find something in a shop that you really like, they won't have it in your size. 
If you take Vitamin C, you won't get a cold. 
Jack will be sad if he don't see you tomorrow. 
If you don't remember to take an umbrella, it will rain.