Am is are, 's, verbs exercise is for kids or young learners. The verb to be is the most irregular verb in the English language. It is normally a linking verb showing existence or the condition of the subject. It can also be used as an auxiliary verb when forming the passive voice. Possessive. When we want to show that something belongs to somebody or something, we usually add an apostrophe + s ('s) to a singular noun and an apostrophe (') to a plural noun, for example: the boy's ball (one boy) the boys' ball (two or more boys). A verb is a word that expresses an action or a state of being. ... Because action verbs and linking verbs are strong enough to be used in sentences all by themselves, they are called main verbs. I love cheese. I turned the page. ( action verbs).