He may come here before five if he()(be)free.

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He may come here before five if he()(be)free.
He may come here before five if he()(be)free.

He may come here before five if he()(be)free.
is
条件状语从句主将从现
may情态动词可看作将来

是 is
(be) 大多数都是放 is, was, were, are
看情况而定