The sound /ɔɪ/ diphthong

  • Form a circle with your lips (as for /ɔ/), and pull your tongue backwards.
  • Breathe out and let your vocal cords vibrate.
  • As you do this, quickly pull your tongue forward and spread your lips widely (as for /ɪ/).

This means your mouth should move from one position to another.

Spelling

  • "oi" - noise, point
  • "oy" - employ, oyster

 

LISTEN
 
Download english phonetics exercises audio
listen_to_-oi-.mp3
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/ɔɪ/.../ɔɪ/.../ɔɪ/.../ɔɪ/...

boy...voice...coin...destroy
 
 
 
Download english phonetics exercises audio
stressed_-oi-.mp3
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This vowel is usually stressed, as in these words:
  • noisy
  • oyster
  • enjoy
 
 
 
Download english phonetics exercises audio
unstressed_-oi-.mp3
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However, /ɔɪ/ can be unstressed. In an unstressed syllable,  /ɔɪ/ is pronounced quickly and softly.
  • alloy
  • viewpoint
  • turmoil
 

COMPARE
 
Compare /ɔɪ/ with /ɑɪ/:
 
Download english phonetics exercises audio
compare_oi-ai_1.mp3
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/ɔɪ/.../ɑɪ/.../ɔɪ/.../ɑɪ/.../ɔɪ/.../ɑɪ/...

These are both diphthong vowels. However, /ɔɪ/ starts with your tongue pulled backwards with your lips forming a circle, and /ɑɪ/ starts with your tongue pulled downwards with your lips widened.
.

 

You can hear the difference between /ɔɪ/ and /ɑɪ/ in these words.
Download english phonetics exercises audio
compare_oi-ai_words.mp3
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1. A. boy, B. by
2. A. voice, B. vice
3. A. toys, B. ties
4. A. foil, B. file
5. A. point, B. pint
6. A. alloy, B, ally
 
 

Now compare /ɔɪ/ and /ɔ/:
 
Download english phonetics exercises audio
compare_oi-o_1.mp3
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/ɔɪ/.../ɔ/.../ɔɪ/.../ɔ/.../ɔɪ/.../ɔ/...

The sound /ɔ/ is a mid, back vowel. The sound /ɔɪ/ starts as /ɔ/ but it moves quickly into a high, front vowel.
 

You can hear the difference between /ɔɪ/ and /ɔ/ in these words.
Download english phonetics exercises audio
compare_oi-o_words.mp3
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1. A. joy, B. jaw
2. A. poise, B. pause
3. A. loin, B. lawn
4. A. oil, B. all
5. A. boiling, B. bawling
6. A. cloying, B. clawing
 
 
PRACTICE
 
 
Listen and repeat these words:
Download english phonetics exercises audio
words_with_-oi-.mp3
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1. boy
2. voice
3. soil
4. coin
5. point
6. annoy
7. noisy
8. avoid
9. oyster
10. poison 
 
11.  exploit
12. enjoying
13. employee
14. boiler
15. alloy
16. viewpoint
17. moisture
18. toiletries 
19. voyage
20. loyal
 

Now, practice /ɔɪ/ in sentences. Say the words first, then the sentences:
Download english phonetics exercises audio
sentences_with_-oi-.mp3
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1. boy - toys
The boy didn't put away all his toys.
2. annoyed - noisy
I'm annoyed by our noisy neighbors.
3. enjoys - coins
My uncle enjoys collecting old coins.
4. employees - joined
The new employees joined us for lunch.
5. pointed - oysters
My friend pointed out the shop that sells oysters.
6. avoid - oil
Please avoid putting too much oil in the food.
 

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