To Be: Affirmative & Negative

4 exercises to revise the verb to be in the affirmative and the negative form:

exercise 1: students have to fill in the gaps with the correct affirmative form;

exercise 2 with the negative of to be;

exercise 3 with either the affirmative (+) or the negative (-), and

4: they have to correct the mistakes in the sentences.

Hope it's useful.