Go up the beach and watch for tourists A so you could warn anyone B before they get to the water C N...........

English ( Master) Modals

Go up the beach and watch for tourists (A)/ so you could warn anyone(B)/before they get to the water. (C)No error(D)

“can” should be used instead of “could” as the given sentence is in present thus “could” should not be used.

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