5 exercises on the voiced and voiceless TH sounds in IT vocabulary.
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How is the "th" in "thread" (as in a thread of execution) pronounced?
The "th" in thread /θrɛd/ is the voiceless /θ/ — tongue tip lightly between or behind the teeth, breath flowing with no vocal-cord vibration, exactly as in "thin," "think," and "throw." So "a worker thread," "thread-safe code." Do not turn it into /t/ ("tread") or /f/ ("fread"), common errors for learners. The /θ/ is the same sound as in the everyday word "thread" (of cotton); programming reuses it directly.
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How is the "th" in "algorithm" pronounced?
The "th" in algorithm /ˈælɡərɪðəm/ is the voiced /ð/ — tongue at the teeth with the voice on, exactly as in "this," "the," and "rhythm" (which it closely echoes). So "AL-go-rith-m," stress on the first syllable. It is a true dental fricative, NOT a plain /t/ ("algoritm") and NOT silent — both common learner errors. Feel the buzz in your throat: that voicing is what makes it /ð/ rather than the breathy /θ/ of "thin."
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How is the "th" in "path" (as in a file path) pronounced?
The "th" in path is the voiceless /θ/, the same as in "bath" and "math": /pæθ/ (US) or /pɑːθ/ (UK). So "the file path," "set the PATH variable." Do not say "pat" (/t/) or "paf" (/f/). Note the vowel differs by accent (short "a" in US, broad "ah" in UK), but the final "th" is always the voiceless /θ/. The plural "paths" softens slightly but keeps a /θ/-based ending.
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How is the "th" in "this" / "that" (very common in code explanations and the keyword "this") pronounced?
The "th" in this /ðɪs/, that, the, and the programming keyword this is the voiced /ð/ — tongue lightly at the teeth, but with vocal-cord vibration (voice on). Contrast this with the voiceless /θ/ in "thin." So the keyword "this.value" is /ðɪs/, not "dis" /dɪs/ or "zis" /zɪs/, which are common learner errors. Feel the buzz in your throat: /ð/ is voiced, /θ/ is not.
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How is the "th" in "method" pronounced?
The "th" in method /ˈmɛθəd/ is the voiceless /θ/, as in "thin" and "Beth" — three sounds: m-e-/θ/-od. So "call the method," "a static method." Do not say "metod" with a /t/ (a frequent error for speakers of languages lacking the /θ/ sound). Stress is on the first syllable: MEH-thod. The ending "-od" is a weak schwa-d /əd/.