How to say in Czech: How should they know that?

English
How should know that?
Czech
Jak to mají vědět?
Which ticket should they buy?
They do not know how they feel.
How do you know that?
He doesn’t know what they mean by that.
They live there.
How much did they pay for that?
They should be writing.
They should have listened to her.
They should work harder.
They should write more.

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