Question

they - go out on sundays fill
modals

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Answer 1

Explanation:

What..................

Answer 2

They should go out on Sundays.

A quick FYI :

'Should' is one of the modal verb among 'must, shall, will, should, would, can, could, may and might'.

'Should' is commonly used to make recommendations or give advice. Sometimes, it is also used to express expectation as well as obligation.

For Ex: When you go to Paris, you should visit the Eiffel Tower.