Fill in the Blanks Positive and negative formsOnline version Ejercicio para practicar la forma positiva y negativa del verbo TO BE. by José Cruz 1 is am is is isn´t not am are are are is are isn´t are is not My name Juan . I am a teacher . She fourteen years old . We students I not tired . He interested in soccer . It not a pencil . You good friends . She twelve years old . You engineers . He a doctor . It a ruler . I cold . You a teacher They are peruvians . We argentinians .