How to control the breath of playing clarinet?

First of all, your technique should be correct. You must press the corresponding hole with each finger. If it is not true, it is easy to miss the sound. Also, be sure to control your breathing and breathe at any time. Don't blow for too long. Actually, playing the flute is the same as singing. If you want to adjust your breathing, you can try to practice exhaling and inhaling more, which will help you!