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Verbs are words that show an action (sing), occurrence (develop), or state of being (exist). Almost every sentence requires a verb. The basic form of a verb is known as its infinitive. The forms call, love, break, and go are all infinitives. A verb is a kind of word (part of speech) that tells about an action or a state. It is the main part of a sentence: every sentence has a verb. In English, verbs are the only kind of word that changes to show past or present tense. Every language in the world has verbs, but they are not always used in the same ways. These verbs include: start, leave, change, live, stop. Auxiliary verbs are also known as helping verbs and are used together with a main verb to show the verb's tense or to form a question or negative. Common examples of auxiliary verbs include have, might, will.