"Whose husband is he?"
Translation:Čí je to manžel?
You have to consider whether the TO is an attribute tightly bound to a noun:
"the husband", "the city", "ten manžel", "to město".
Or if it is a part of the subject-predicate construction. To je X. This/That/It is X.
To je muž. To je žena. To je město. To jsem já. To jsi ty. To jsme my. That is a man. This is a woman. That is a city. This is me. That's you. This is us.