The crossword solutions for the term FORM OF 'TO BE' are ARE, IS, and AM. ARE is a form of the verb 'to be' used in the present tense, typically to indicate a plural subject. IS is a form of the verb 'to be' used in the present tense, typically to indicate a singular subject. AM is a form of the verb 'to be' used in the present tense, typically to indicate a first person singular subject. All three forms of the verb 'to be' are used to indicate a state of being or existence.