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

English
How should know that?
Czech
Jak to má vědět?
Which ticket should he buy?
He does not know how he feels.
How do you know that?
He is young.
He lives there.
He doesn’t know what he means by that.
How much did he pay for that?
He should be writing.
He should have listened to her.
He should work harder.

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