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

English
Is it made of
Czech
Je to ze železa?
It is made of iron.
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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