How to say in Czech: What should they wear?

English
What should wear?
Czech
Co si mají vzít na sebe?
What are they wearing?
What will they wear?
She was wearing a black coat.
She was wearing a coat.
Which ticket should they buy?
They live there.
How should they know that?
They should be writing.
They should have listened to her.
They should work harder.

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