1. First, circle your thumb and index finger to form an "OK" gesture. Bend the thumb of your dominant hand inward, and at the same time, bend the index finger of the same hand slightly until the tips of the two fingers touch.

2. Licking wet lips. Move your tongue up and down to moisturize your upper and lower lips. We don’t need to moisturize so much that saliva is dripping from the corners of our mouths, but at least our lips need to be absolutely moist.

3. Place your tongue on the "OK" circle. Place the circle formed by your thumb and index finger in front of your mouth. Stick out your tongue and touch it to where the two fingers meet.

4. Place your lips around your fingers and close them. Use your fingers to push your tongue into your mouth. The lips then wrap around the fingers and close, leaving only a small hole between the circle formed by the upper lip and the fingers.

5. Blow the air out of your mouth. Take a deep breath through your nose and blow the air out through the air holes created by your fingers and lower lip. When done correctly, you will hear a clear and loud whistle.

Extended information:

1. The use of breath during external pronunciation practice

1. After inhaling, the diaphragm rises, the abdominal muscles contract, the chest muscles are fixed, and the air inlet is closed, slowly pushing the air in the lungs toward the mouth. In this way, a pressure is formed in the mouth, which is called "oral pressure".

2． The volume is directly proportional to the flow of breath. The greater the airflow, the louder the volume; the smaller the airflow, the smaller the volume. The thickness of the sound is directly proportional to the breath. The larger the breath, the more powerful the sound; the smaller the breath, the smoother and more delicate the sound.

2. Volume practice

Volume is the life of whistle music. If you want to make a rich and full whistle, you must practice volume. There are two ways to practice volume;

1. Play at maximum volume. After blowing, continue to hold. Consciously control the diaphragm and abdominal muscles to supply air to the mouth at a uniform speed. After practicing the sound induction of the brain, hearing, oral cavity, nasal cavity and other organs, I feel that the sound blown out is both smooth and full of sound.

2． The sound went from small to loud and then quiet. The sound you blow is made quietly at first, and then gradually becomes louder. When it reaches the maximum, it should be maintained for a period of time until the sound disappears.