The verb to be
I am
=
I'm
you are
you're
he is
he's
she is
she's
it is
it's
are not
aren't
is not
isn't
a or an?
a = b, c, d ...
an = a, e, i, o, u
a banana, a car, a dog...
an apple, an elephant, an igloo, an orange, an umbrella
"What's this?"
"It's an apple."
"And this?"
"It's a pear."
"And what's this?"
"It's a car."
"And what are these?"
"They're biscuits."
"And these?"
"They're eggs."
"Who's this?"
"It's Mr. Bean."