How to say in Czech: I forgot their birthday.

English
forgot birthday.
Czech
Já jsem zapomněl na jejich narozeniny.
It’s their birthday today.
Their birthday is around the corner.
They are inviting her to their birthday party.
What did they get for their birthday?
What would they like for their birthday?
When is their birthday?
I do not celebrate birthdays.
Are you looking forward to your birthday party?
Happy birthday.
How was your birthday?

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