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

English
How should know that?
Czech
Jak to máme vědět?
Which ticket should we buy?
We do not know how we feel.
How do you know that?
He doesn’t know what we mean by that.
We don’t know that.
How much did we pay for that?
We have to find out how to do that.
We should be writing.
We should have listened to her.
We should work harder.

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