Find the verbs that: a) can perform the function of the predicate in the sentences:
to have been translating; will have; being asked; having gone; could be answered; to be designing; are coming, ought to do, to stop.
b) can not perform the function of the predicate in the sentence:
was being done; will have gone; to have been asking; being given; are reading; having spoken; could be stopped; to be building; has been answered; ought to come; is giving.