Rain is forecast for tomorrow.
?? rain
Is "forecast" an adjective or a past-participle used to form passive (to be plus -ing form of the verb)?
How do we decide which form is used here?
There is no adjective "forecast" and it's not a noun here, so it must be verb in a passive construction. Note that we could add a by phrase, as in "... is forecast by the Met Office".
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There is no adjective "forecast" and it's not a noun here, so it must be verb in a passive construction.
Note that we could add a by phrase, as in "... is forecast by the Met Office".
Incidentally, I think you meant to say "to be plus ed (not -ing) form of the verb".