1. if it doesn't rain, there will be a shortage of water

2. if you don't listen to the teacher, you can't understand what she is saying

3. if i were you, i would surf the Internet for more information

4. if the weather were fine, we could go on a picnic

5. if you don't drive carefully, you may have an accident

6. if he weren't lazy, he would get high scores

7. if it rain tomorrow, will we go to the meeting?

8. if Mai had a good command of English, she could apply for that position

9. if you read the instructions carefully, you can install the machine

10. unless your sister study harder,  she will fair the exam

11. if i didn't live too far from you, i could visit you every day

12. Hoa would speak English fluently if she practiced it daily