Teacher Charmain stands in front of a big screen.

Teacher Charmain is in her twenties, with brown hair in a low ponytail. She wears jeans and a blue Homework Zone T-shirt.

She says HI, TVOKIDS.
IT'S TEACHER
CHARMAIN HERE.
WE'RE GOING TO TALK
ABOUT PREFIXES TODAY,
WHICH IS GOING
TO HELP US
WITH OUR READING
AND WRITING.
A PREFIX IS A
GROUP OF LETTERS
THAT COME BEFORE A ROOT
WORD OR AN ACTUAL WORD
WHICH HELPS US TO UNDERSTAND
THE MEANING OF THE WORD.
PREFIXES ACTUALLY
HAVE THEIR OWN MEANINGS
EVEN THOUGH THEY'RE NOT
WORDS TO THEMSELVES.
THERE'S THREE PREFIXES WE'RE
GOING TO FOCUS ON TODAY.
THE FIRST ONE
BEING PRE, P-R-E,
WHICH MEANS BEFORE.
THEN THE PREFIX RE,
MEANS AGAIN.
AND THE PREFIX SUB MEANS
UNDER OR BELOW OR BENEATH.
SO LET'S SEE HOW WE
CAN USE THESE PREFIXES
TO HELP US UNDERSTAND
ROOT WORDS.
IF WE HAVE A ROOT WORD
AND WE UNDERSTAND
WHAT THE ROOT WORD MEANS,
WE CAN ADD THAT PREFIX
BEFORE THE ROOT WORD TO HELP
US TO CHANGE THE MEANING
OR TO UNDERSTAND THE
MEANING OF THE WORD.
LET'S TRY IT
WITH PRE;
WE KNOW THAT PRE
MEANS BEFORE.
SO WE HAVE THE
ROOT WORD VIEW.
WHEN WE ADD PRE TO
IT, IT'S PREVIEW.
THAT MEANS TO
VIEW IT BEFORE.
BEFORE ACTUALLY
WATCHING IT,
THAT'S WHAT
PREVIEW MEANS.
THEN WE HAVE
PRECAUTION;
CAUTION IS THE
ROOT WORD.
WE ADD PRE TO IT; CAUTION
MEANS TO BE CAREFUL.
SO IT MEANS, BEFORE
YOU DO SOMETHING,
TO BE VERY CAREFUL.
A PRECAUTION.
AND THEN WE
HAVE PREVENT.
THIS IS WHERE WE HAVE AN
INSTANCE WHERE THE PREFIX
HELPS US TO UNDERSTAND
THAT IT'S BEFORE.
VENT ITSELF IS NOT NECESSARILY
A WORD IN THIS CASE.
BUT WHEN WE PUT
IT TOGETHER,
IT MEANS TO
PREVENT SOMETHING,
IS TO BE CAREFUL BEFORE
YOU DO SOMETHING.
SO THAT'S WHEN
WE CAN USE PRE.
LET'S TRY RE NOW.
WE KNOW THAT RE
MEANS AGAIN.
AND IF WE HAVE THE
ROOT WORD VIEW AND
WE HAVE RE BEFORE IT, IT
MEANS TO VIEW IT AGAIN.
REVIEW.
REDO; DO IS THE
ROOT WORD.
WE KNOW WHAT
THAT MEANS.
WHEN WE ADD
RE TO IT,
IT MEANS TO DO
IT AGAIN.
AND TO INVENT; REINVENT
MEANS TO INVENT IT AGAIN,
TO TRY IT AGAIN.
LET'S TRY IT
WITH SUB.
SO SUB MEANS UNDER.
SO WHEN WE ADD THAT PREFIX
SUB TO THE WORD MARINE,
WHICH MEANS WATER,
WE HAVE SUBMARINE,
WHICH MEANS
UNDER THE WATER.
AND THEN WHEN WE ADD
THE PREFIX SUB
TO THE ROOT WORD ZERO,
SUBZERO, IT MEANS -
WHAT DO YOU THINK?
BELOW ZERO.
SO WHEN WE THINK OF
TEMPERATURE
WHEN IT'S BELOW ZERO,
THAT'S WHERE WE
GET SUBZERO.
AND THEN, SUBWAY.
FOR THOSE OF YOU WHO HAVE
TAKEN THAT TRANSIT SYSTEM,
IT WORKS UNDERNEATH
THE GROUND.
THE SUBWAY IS
UNDER THE GROUND.
SO THAT'S WHY WE
CALL IT THE SUBWAY.
IT'S UNDER WAY.
IT'S UNDER THE
GROUND.
THOSE ARE GREAT EXAMPLES
OF HOW TO USE PREFIXES
TO HELP US UNDERSTAND
ROOT WORDS
AND THE WAY THAT WORDS
CHANGE THEIR MEANING.
AND ALSO TO HELP
US TO READ.
SO WHEN WE SEE PREFIXES AND
WE KNOW WHAT THEY MEAN,
IT HELPS US BETTER
UNDERSTAND THE WORD.
NOW THAT YOU'VE GOT A TASTE
FOR WHAT PREFIXES ARE,
LOOK FOR THEM IN YOUR
READING AND WRITING.
IT'LL HELP YOU BE A
MUCH BETTER READER.
WAY TO GO, TVOKIDS.
SEE YOU SOON.