Definitions

1. verb

to have existence or being

“I am a student.”

2. auxiliary verb

used to form the present simple tense, the past simple tense, the past continuous tense, and the present perfect tense

“She is a doctor. (present simple) / He was a teacher. (past simple) / They were studying. (past continuous) / I have eaten breakfast. (present perfect)”

3. auxiliary verb (contraction)

a shortened form of ‘am is are’ used to form the present simple tense, the past simple tense, the past continuous tense, and the present perfect tense

“I’m going to the store.”

4. auxiliary verb (contraction)

a shortened form of ‘am has have’ used to form the present perfect tense

“I’ve eaten breakfast.”