How to say in Czech: Is it made of plastic?

English
Is it made of
Czech
Je to z umělé hmoty?
It is made of plastic.
What is it made of?
The box is made of wood.
What made you change your mind?
He made that mistake on purpose.
We made pancakes for breakfast.
Who made breakfast?
You made a wise choice.
Your letter made me happy.
Don’t be afraid of making mistakes.

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