You're close! While particles in a solid can't move freely like in a liquid or gas, they do vibrate.

Here's a breakdown:

* Solids: Particles are tightly packed and held together by strong forces. This restricts their movement to vibrations around fixed positions. Think of them as jiggling in place!

* Liquids: Particles have more freedom to move around, but they are still close together.

* Gases: Particles are far apart and move freely, colliding with each other and the container walls.

So, the answer to your question is: Particles in a solid can only vibrate around their fixed positions.