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.

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