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

Kisdobos December 22, 2016

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 length: 4 minutes 51 seconds
Tags:
Copyright license: Creative Commons Attribution Share Alike License
First published: 2016-12-22, 01:28:50 (GMT+1)
About the author
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

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

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
hi
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!