Such sentences are formed & used to express the state and or identity of somebody/ something.
Simple Present
Subject + is/ am/ are + noun.
I am a teacher.
We are teachers.
You are a teacher.
You are teachers.
He is a teacher.
She is a teacher.
They are teachers.
Rekha is a teacher.
Mohit is a teacher.
Rekha and Mohit are teachers.
Simple Past
Subject + was/ were + noun.
I was a teacher.
We were teachers.
You were a teacher.
You were teachers.
He was a teacher.
She was a teacher.
They were teachers.
Rekha was a teacher.
Mohit was a teacher.
Rekha and Mohit were teachers.
Simple Future
Subject + will be + noun.
I will be a teacher.
We will be teachers.
You will be a teacher.
You will be teachers.
He will be a teacher.
She will be a teacher.
They will be teachers.
Rekha will be a teacher.
Mohit will be a teacher.
Rekha and Mohit will be teachers.
Simple Present
Subject + is/ am/ are + adjective.
I am good.
We are good.
You are good.
You are good.
He is good.
She is good.
They are good.
Rekha is good.
Mohit is good.
Rekha and Mohit are good.
Simple Past
Subject + was/ were + adjective.
I was good.
We were good.
You were good.
You were good.
He was good.
She was good.
They were good.
Rekha was good.
Mohit was good.
Rekha and Mohit were good.
Simple Future
Subject + will be + adjective.
I will be good.
We will be good.
You will be good.
You will be good.
He will be good.
She will be good.
They will be good.
Rekha will be good.
Mohit will be good.
Rekha and Mohit will be good.
Simple Present
Subject + is/ am/ are + adverb + adjective.
I am very good.
We are very good.
You are very good.
You are very good.
He is very good.
She is very good.
They are very good.
Rekha is very good.
Mohit is very good.
Rekha and Mohit are very good.
Simple Past
Subject + was/ were + adverb + adjective.
I was very good.
We were very good.
You were very good.
You were very good.
He was very good.
She was very good.
They were very good.
Rekha was very good.
Mohit was very good.
Rekha and Mohit were very good.
Simple Future
Subject + will be + adverb + adjective.
I will be very good.
We will be very good.
You will be very good.
You will be very good.
He will be very good.
She will be very good.
They will be very good.
Rekha will be very good.
Mohit will be very good.
Rekha and Mohit will be very good.
Simple Present
Subject + is/ am/ are + adjective + noun.
I am a good teacher.
We are good teachers.
You are a good teacher.
You are good teachers.
He is a good teacher.
She is a good teacher.
They are good teachers.
Rekha is a good teacher.
Mohit is a good teacher.
Rekha and Mohit are good teachers.
Simple Past
Subject + was/ were + adjective + noun.
I was a good teacher.
We were good teachers.
You were a good teacher.
You were good teachers.
He was a good teacher.
She was a good teacher.
They were good teachers.
Rekha was a good teacher.
Mohit was a good teacher.
Rekha and Mohit were good teachers.
Simple Future
Subject + will be + adverb + adjective + noun.
I will be a good teacher.
We will be good teachers.
You will be a good teacher.
You will be good teachers.
He will be a good teacher.
She will be a good teacher.
They will be good teachers.
Rekha will be a good teacher.
Mohit will be a good teacher.
Rekha and Mohit will be good teachers.
Simple Present
Subject + is/ am/ are + adverb + adjective + noun.
I am a very good teacher.
We are very good teachers.
You are a very good teacher.
You are very good teachers.
He is a very good teacher.
She is a very good teacher.
They are very good teachers.
Rekha is a very good teacher.
Mohit is a very good teacher.
Rekha and Mohit are very good teachers.
Simple Past
Subject + was/ were + adverb + adjective + noun.
I was a very good teacher.
We were very good teachers.
You were a very good teacher.
You were very good teachers.
He was a very good teacher.
She was a very good teacher.
They were very good teachers.
Rekha was a very good teacher.
Mohit was a very good teacher.
Rekha and Mohit were very good teachers.
Simple Future
Subject + will be + adverb + adjective + noun.
I will be a very good teacher.
We will be very good teachers.
You will be a very good teacher.
You will be very good teachers.
He will be a very good teacher.
She will be a very good teacher.
They will be very good teachers.
Rekha will be a very good teacher.
Mohit will be a very good teacher.
Rekha and Mohit will be very good teachers.