In Present perfect^x, Modal auxiliaries^x

A. The present perfect in the passive: A new house has been built. Two new houses have been built.B. The perfect infinitive in the passive: The perfect infinitive is usually used with a defective auxiliary (also known as a modal auxiliary). The defective auxiliaries are can, could;...

Too big a question for mortal grammarians, Brinda. BE = exist; copulative verb: You are hungry. COPULATIVE + ADJECTIVE I am Mister Micawber. COPULATIVE + NOUN He is coming. AUXILIARY OF CONTINUOUS ASPECT DO = perform; auxiliary: I do the bookkeeping. TRANSITIVE VERB She doesn't eat...