Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

[Q]: Fact: Matter in the gas phase has variable shape
[A]: A solid has a fixed shape. When liquid is boiled and turns into gas, its shape is?


[Q]: Fact: the sun is a source of light called sunlight
[A]: Sunlight is a source of light from what?


[Q]: Fact: An example of playing a musical instrument is hitting the keys of a piano
[A]:
A person wants to play a song out yet lacks an instrument, so they can?