Verb forms are the different ways that verbs can BE used in a sentence. The three-letter solution ARE is the present TENSE of the verb 'TO BE'. TENSE is a five-letter solution which refers TO the time in which an action takes place, such as past, present, or future. BE is a two-letter solution which is the infinitive form of the verb 'TO BE'. PARTICIPLE is a ten-letter solution which is a verb form that can BE used as an adjective or noun. MOOD is a four-letter solution which refers TO the attitude of the speaker when using a verb, such as indicative, imperative, or subjunctive. INFINITIVE is a ten-letter solution which is the basic form of a verb, usually preceded by 'TO'. WAS is a three-letter solution which is the past TENSE of the verb 'TO BE'. PASTTENSE is a nine-letter solution which is a verb form that expresses an action that has already happened.