sentences:  Some analyses add pronouns as a class separate from nouns, and subdivide conjunctions into subordinators and coordinators, and add the class of interjections.English also has a rich set of auxiliary verbs, such as "have" and "do", expressing the categories of mood and aspect.Questions are marked by do-support, wh-movement (fronting of question words beginning with "wh"-) and word order inversion with some verbs.