My book says, If the verb sein is followed by a noun in the plural, the verb has a plural ending even if the subject is singular.
ex. Es sind Störche.
My question is, What if the subject is in a plural form and predicate nominative is in a singular form, then in which form (singular or plural) will the verb be? I am asking this question out of my curiosity though I am not sure if such sentence form exist or not.