Question

They must have come in full circle ( State the function of modal auxiliary )

Answer 1

Modal verbs are used to express a permission, an obligation, a lack of necessity, a possibility, ability, prohibition, advice and probability.

may, might, can, could, will, would, shall, should, must, need, dare, ought to (These are modal auxiliary verbs)

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Answer 2

Answer:

They must have come full circle.

Function : past certainty.