GRAMMAR, PLAINLY.
VERBS → TO BE · RULE 18

to be

The most common verb in English. It says who you are, how you feel, where things stand — and it follows its own rules everywhere.

FORMULA
am / is / are
ONE VERB, FIVE FACES
NOWPAST
Iamwas
he / she / itiswas
you / we / theyarewere
THE THREE FORMS
+
She is a doctor.
subject + be
She isn't tired.
be + not
?
Is she at home?
flip: be + subject
to be never needs do: Is she…? She isn't. Do only helps other verbs.
SHORT FORMS
I am → I'm
she is → she's
they are → they're
is not → isn't
are not → aren't
was not → wasn't
SAY IT WITH BE
ageShe is 25.
feelings & statesI am cold. He is afraid.
there is / there areThere is a café near here.
COMMON MISTAKES
She have 25 years.→ She is 25.age uses be
I am agree.→ I agree.agree is a verb itself
They was happy.→ They were happy.they → were