5 exercises on voiceless and voiced TH sounds in IT vocabulary.
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Which word uses the voiceless /θ/ sound (as in "think")?
Thread /θrɛd/ begins with the voiceless th sound /θ/, the same as in think, three, and path. To make it, place your tongue lightly between your teeth and blow air with no voice. Contrast this with the voiced /ð/ in this, these, and that, where the vocal cords vibrate. In concurrency, a thread runs code; the voiceless /θ/ start is important. Many learners replace /θ/ with /t/ or /s/, turning thread into tread or sread.
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Why might "three" be confused with "tree"?
Three /θriː/ starts with the voiceless /θ/, while tree /triː/ starts with a plain /t/. Learners who lack /θ/ often substitute /t/, so three collapses into tree. The fix is tongue position: for /θ/ the tongue tip touches the teeth and air flows continuously; for /t/ the tongue taps behind the teeth and air bursts. In tech you say "a tree structure" (data) and "three replicas" (count), so keeping /θ/ and /t/ distinct prevents real confusion.
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Which word uses the voiceless /θ/ (as in "path")?
Path /pɑːθ/ (or /pæθ/) ends with the voiceless /θ/ sound, the same th as in math and both. The tongue sits between the teeth with no voicing. A file path is everywhere in computing, so a clear final /θ/ matters. Learners sometimes turn the ending into /s/ (pass), /t/ (pat), or /f/ (paff). The plural paths keeps the voiceless cluster /θs/. Practising the final /θ/ in path sharpens your filesystem and routing vocabulary.
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Which word uses the VOICED /ð/ sound (as in "the")?
With /wɪð/ ends in the voiced th sound /ð/, where your vocal cords vibrate, the same as in this, that, and mother. It contrasts with the voiceless /θ/ in path and thread. Place your tongue between your teeth and add voice. Some speakers use /θ/ in with regionally, but the standard form is voiced /ð/. In phrases like "with retries enabled", a clear voiced ending sounds natural. Feeling the vibration in your throat confirms you are producing /ð/, not /θ/.
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What is the key difference between /θ/ and /ð/?
Both /θ/ and /ð/ are made with the tongue between the teeth, but /θ/ is voiceless (no vocal-cord vibration, as in think, three, path) and /ð/ is voiced (vocal cords vibrate, as in this, that, with). The only difference is voicing. To feel it, touch your throat: /ð/ buzzes, /θ/ does not. Many languages lack both sounds, so learners substitute /t/, /d/, /s/, or /z/. Mastering the tongue-between-teeth position and toggling voicing on or off produces both correctly.