5 exercises on voiced vs voiceless consonant twins — /b/–/p/, /d/–/t/, /ɡ/–/k/, /z/–/s/, /v/–/f/ — in tech words.
Voiced / voiceless twins
/b/–/p/ bilabial stops
/d/–/t/ alveolar stops — code/coat
/ɡ/–/k/ velar stops — bug/buck
/z/–/s/ alveolar fricatives — zip/sip
/v/–/f/ labiodental fricatives — save/safe
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1 / 5
What is meant by a voicing contrast between two consonants such as /b/ and /p/?
Voicing = whether the vocal cords vibrate:
A voicing contrast pairs two consonants that are articulated identically (same place, same manner) and differ only in whether the vocal cords vibrate:
Voiced (cords vibrate): /b/, /d/, /ɡ/, /z/, /v/
Voiceless (no vibration): /p/, /t/, /k/, /s/, /f/
Each voiced sound has a voiceless "twin":
/b/–/p/ (bilabial stops)
/d/–/t/ (alveolar stops)
/ɡ/–/k/ (velar stops)
/z/–/s/ (alveolar fricatives)
/v/–/f/ (labiodental fricatives)
Test it: put a hand on your throat and say "zzz" then "sss" — you feel vibration for /z/, none for /s/. The mouth position is identical.
2 / 5
A developer says bug but is heard saying buck. Which IPA captures the voicing contrast in the FINAL consonant?
bug /bʌɡ/ vs buck /bʌk/ — /ɡ/ vs /k/:
Same vowel /ʌ/ (the STRUT vowel, as in "cut"), same initial /b/; the words split on the final velar stop:
/ɡ/ voiced — bug, debug, log, tag
/k/ voiceless — buck, lock, tack, mock
"There is a bug" must not become "there is a buck".
Pre-consonant vowel length cue: English lengthens the vowel slightly before a voiced consonant, so the /ʌ/ in "bug" is fractionally longer than in "buck" — a reliable secondary signal when final-consonant voicing is hard to hear.
Sibling pairs in tech:
tag /tæɡ/ vs tack /tæk/
pig /pɪɡ/ vs pick /pɪk/
3 / 5
In a deployment chat someone says code; a non-native colleague pronounces it as coat. Which voicing contrast is responsible?
code /kəʊd/ vs coat /kəʊt/ — /d/ vs /t/:
Here the voicing contrast is the alveolar stop pair /d/–/t/ (tongue tip on the ridge behind the upper teeth):
/d/ voiced — code, load, build, read
/t/ voiceless — coat, note, root, wrote
Many learners devoice final stops, turning every final /d/ into /t/, so "code" → "coat", "build" → "built", "load" → "lote".
Fix: keep the vocal cords humming through the /d/ and let the preceding vowel run slightly long. Compare "code review" (voiced) with "winter coat" (voiceless).
More /d/–/t/ pairs:
bed /bɛd/ vs bet /bɛt/
hard /hɑːd/ vs heart /hɑːt/
Option A is wrong: there is no /b/–/p/ contrast in "code/coat".
4 / 5
A developer says zip (compress a file) and a listener hears sip. Which IPA describes the initial voicing contrast?
zip /zɪp/ vs sip /sɪp/ — /z/ vs /s/:
The alveolar fricative voicing pair, here word-initially:
/z/ voiced — zip, zoom, zero, zone
/s/ voiceless — sip, see, sync, source
Languages that lack initial /z/ (e.g. Spanish, German) often devoice it, so "zip the folder" sounds like "sip the folder".
Hold the sound to feel it: say a long "zzzzz" — buzzing/vibration — then "sssss" — pure hiss, no buzz. Same tongue position.
Tech-relevant /z/–/s/ pairs:
zip vs sip
zoo vs Sue
final position: buzz /bʌz/ vs bus /bʌs/ — "the message bus"
Spelling trap: the plural "s" is often voiced /z/ — "bugs" is /bʌɡz/, "logs" is /lɒɡz/, not /-s/.
5 / 5
In rapid speech the word value can be confused with the phrase fail you. Which voicing pair explains the /v/-vs-/f/ confusion, and how does /v/ differ from /f/?
/v/ vs /f/ — labiodental fricatives:
Both /v/ and /f/ are made with the upper teeth touching the lower lip, air forced through:
They are a voicing pair, so the only difference is vocal-cord vibration. Learners who lack /v/ may substitute /f/ (or /w/), so "value" can drift toward "fal-you / fail-you", and "save" toward "safe".
Crucial tech minimal pair:
save /seɪv/ vs safe /seɪf/ — "did you save it?" vs "is it safe?"
vault /vɔːlt/ vs fault /fɔːlt/ — "the secrets vault" vs "a fault in the system"
Tip: for /v/ keep the buzz going; for /f/ it is pure friction. Both need teeth on lip — do not collapse them into /w/ or /b/.