Hi, to be + past participle is a passive form which is used when we mean someone does something, and that thing is done by the person; or to prefer something's nature... ex: Your homework has to be done before you submit it. (You have to do your homework if you want to submit it) A decision has to be made.
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vts nairusage of to be ...This work has to be done = Somebody has to do this work soon.