How can solid change its shape?

Answer 1

You could easily melt it.

Or sublimate it.

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A:

Melting and sublimation change the physical state so you no longer have a solid.

Solids can be bent, stretched, and flattened.

Ductility and malleability are the properties in which metals can be formed.

All materials also have thermal expansion properties. Usually this doesn't affect the overall shape significantly, but it could cause items that fit tightly to become loose. If two metals with different thermal expansion properties are annealed together, they can bend when heated, and return to the original shape when cooled. Thermostats may use this property.

Certainly if you think of the rubber in a balloon being a solid, then its shape is dependent on the pressure of the gasses inside and outside of it.