TedEd: What Causes Cavities? (Passive vs Active Voice Practice)

Task description & scene summary

Task description:

I set this video up to practice passive vs active voice by means of 13 multiple choice questions. In some of the questions I picked verbs whose active form already implies sort of a passive meaning, e.g. "accumulate", "surge", "decline", and test whether students can decide between the passive and the active voice. In other questions I gapped passive voice constructs, and again check if students can guess the right form.

I also included some advanced passive constructs, e.g. passive ellipsis: "When exposed to sugar ..." (=when it is exposed to ...), and "is to blame" (=has to be blamed).

Because hearing the well-formed sentences is a huge help for students, I decided to make the task more difficult by mischievously letting the video play on after each gapped sentence to wipe out their hearing memories a bit. :)

I think the biggest merit of such a video-based grammar quiz is to prompt students to pay attention to and notice certain grammar structures, which they may otherwise ignore when simply 'consuming' the content of a video.

Scene summary:

This 5-minute TedEd video deals with the causes of cavities and how we can avoid them.

Video source: What causes cavities? - Mel Rosenberg

Video length: 4 minutes 51 seconds

Video genre: Edu or explainer video (e.g. TedEd, TED conference, home-made explainer)

Lesson type: Basic listening comprehension - Hearing check ("Can you make out the words being said?")

Level:

Student types:

Tags:

dentist
teeth
health
cavities
TedEd

Vocabulary:

Health, going to the doctor

Grammar:

Passive voice or active voice

Copyright license: Creative Commons Attribution Share Alike License

First published: 2016-12-22, 01:28:50 (GMT+1)

About the author

Kisdobos

I am one of the co-founders of iSLCollective.com. I had taught English in many contexts, as a private tutor, then in companies, and in high schools. I am active in creating video quizzes on our video quiz platform.

KIERAN DONAGHY ABOUT ISLCOLLECTIVE VIDEO QUIZZES:

"iSLCollective Interactive Video Quizzes are highly engaging and motivating multimodal texts for English language students to learn vocabulary and improve their listening skills. They are the perfect complement to the creative and innovative lesson plans on Film English."

Kieran Donaghy,
Creator of FilmEnglish.com, a site with hundreds of high quality, free ESL/EFL lesson plans created around short films

Video quiz questions (printable)

1) The teeth of those ancient humans ...

riddled holes
were riddled holes
were riddled by holes
were riddled with holes

2) Our teeth naturally begin to ... communities of bacteria.

be accumulated
be accumulated by
accumulate
accumulating

3) Diets high in sugary foods ... an explosion of bacteria.

cause
caused
are caused
were caused by

4) Each human tooth ... in a hardy protective layer called enamel.

coats
coated
is coated
was coated

5) The blood vessels and nerves ... deep within.

enclose
enclosed
are enclosed
were enclosed

6) Without treatment, the whole tooth ...

may infect
may infected
may become infecting
may become infected

7) The more sugar our food contains, the more ...

our teeth put at risk
our teeth are put at risk
put our teeth at risk
risk we put our teeth

8) When ... enzimes in the saliva, carbohydrates get broken down into simpler sugar.

exposes to
is exposed to
exposed by
exposed to

9) The teeth of ancient humans ... sugars.

were still exposed to
were still exposed by
still exposed to
still exposed by

10) After the industrial revolution, incidents of cavities ...

surged
was surged
were surged
have been surged

11) For most, high sugar consumption ...

is blamed
is blame
is to blame
blamed

12) When cavities ..., we use fillings to close off the infected area.

developed
are developed
do developed
do develop

13) Gradually, the number of sugar loving bacteria in your mouth ...

will decline
will be declined
will declined
is to decline

About the author

Kisdobos

KIERAN DONAGHY ABOUT ISLCOLLECTIVE VIDEO QUIZZES:

Kieran Donaghy,
Creator of FilmEnglish.com, a site with hundreds of high quality, free ESL/EFL lesson plans created around short films

Comments

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Gabriellejulian1

2017-01-06 12:40:20

Thanks

tiasika

2017-01-16 06:48:36

Thanks

dan1238

2017-06-21 12:14:20

Thanks

Joe007

2017-08-15 14:05:38

Thanks

Vlrglebova

2018-03-07 18:13:34

Thank you! ^.^

ProfNena

2018-05-18 00:47:16

OMG, this site is going to help me a lot! I´m crazy about creating my own activity. Thanks!

DDADDD

2018-07-02 01:34:21

Great, thank you for sharing!

auu1

2018-07-02 12:19:24

Valentina1302

2018-09-28 11:56:25

Where are the answers, guys?)

Miruca1958

2019-01-21 08:14:53

Great movie. Wonderful fill ins

LizEvans

2019-02-20 21:32:08

Shouldn't it be "riddled with holes"? Other than that, a great quiz!

Tetkra

2019-03-24 18:41:33

That's great!!! Exactly what I needed!! Thanks a lot!))))

Ganah959

2020-03-17 13:48:21

Thank you I liked the video. I learn so much!

sev1212

2020-04-27 02:36:08

Thank you so much for this extra amazing video!!!!

mgraciana

2020-05-05 00:51:34

Very good material- thanks for sharing!

begoborras

2021-02-22 17:54:57

Thanks!