How to say in Czech: When will they start playing?

English
When will they start playing?
Czech
Kdy začnou hrát?
Do they play tennis?
They started their own company.
They started walking.
Classes start in the morning.
Even the best fish starts to smell after three days.
You should start now.
They live there.
When will they see each other again?
They didn’t write that.
They hate it when there are a lot of people.

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