1.if you don't stop telling lies, noone will trust you.
2. if you don't pay attention to the teacher, you can't understand the lesson.

If you tell lies, no one will trust you.
If you don't pay attentionto the teacher, you can't understand the lessons.
If you don't go to bed early, you will be exhausted the next morning.
if you save money from now, you can reward yourself with a long vacation at the end of the year
if you read more book, you can boarden your english
if you don't brush your teeth often, you can get toothache
if you don't listen carefully, you won't know what to do
if you don't want to get sick, you should eat more healthily