- Tapping two objects together causes the particles in those objects to vibrate
- Glass is a kind of object
- A fork is a kind of object
- So, tapping a fork against a glass causes the particles in the objects to vibrate

- Tapping a fork against a glass causes the particles in the objects to vibrate
- Vibrations are a source of sound
- Hence, the vibration of the particles caused by tapping the fork on a glass is a source of sound

- The vibration of the particles caused by tapping the fork on a glass is a source of sound
- A source of something produces that something
- Therefore, the vibration of the particles caused by tapping the fork on a glass produces sound

So, the vibration of the particles caused by tapping the fork on a glass produces sound
Question: Why does tapping a fork against a water glass produce a sound?
Context: - Tapping two objects together causes the particles in those objects to vibrate 
- A source of something produces that something 
- Vibrations are a source of sound 
- Glass is a kind of object 
- A fork is a kind of object