water should keep its level(universal truth)modal auxiliary
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Explanation:
The modal auxiliary could is used
to express an ability in the past: I could always beat you at tennis when we were kids.
to express past or future permission: Could I bury my cat in your back yard?
to express present possibility: ...
to express possibility or ability in contingent circumstances:
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➡The auxiliary verb in the given sentence is keep.......
please mark as brainliest....
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