Unit 1.1

To be is a linking verb and an auxiliary verb that is essential in grammar.

As a linking verb, it describes a subject and tells a quality or an aspect of it:

• When expressed in its affirmative form, the verb confirms something about the subject.
• When expressed in its negative form, the verb denies something about the subject.
• When expressed in its interrogative form, the verb is used to ask something about the subject.