... participles or the past participles or infinitive to form ordinary verbs, they are not added to the meaning of the main verbs. But when they stand alone, they are the meaningful verbs. The auxiliary ... had read. “I’m beginning to think I must have been”. (The Moonstone Wilkie Collins, 88)–Besides, we are easy to find the auxiliary “be” in the following structures .a.Be + Infinitive:This structure ... sentences, “do” stands at the beginning of the sentence and the verb following it must be infinitive without “to”.Eg: Do come in! From the above examples, we easily realize that the primary auxiliaries...