One of the First Words You Ever Learned Has Two Pronunciations — and Nobody Told You
That was probably one of the first fifty words you learned. The dictionary gives you one pronunciation, /ðæt/, and that's the one you've been using ever since. But native speakers say this word two completely different ways depending on what job it's doing in the sentence — and half the time, it isn't /ðæt/ at all. You haven't mispronounced a single sound in it. You've just never noticed that that is secretly two different words wearing the same spelling.
Job one: pointing at something — it carries meaning, so it stays full
When that points to a specific thing, or stands in for one on its own, it's a content word. Remove it and the sentence falls apart or means something else. This that is always said in full, stressed, with a clear vowel — /ðæt/:
- I want that. /aɪ wɒnt ðæt/ — pointing at an object
- That's incredible. /ðæts ɪnˈkredəbl/ — that is the subject, standing for something just mentioned
- Give me that book, not this one. /ðæt bʊk/ — that is doing real contrastive work here
In every one of these, that is holding information. It doesn't get to shrink.
Job two: grammatical glue — it almost never gets said in full
When that introduces a clause — an object clause or a relative clause — it isn't pointing at anything. It's just a connector holding two clauses together. Since it carries no meaning of its own, it falls under English's general rule: unstressed words get reduced. It collapses to /ðət/, and very often gets dropped from speech entirely:
- I think that she's right. /aɪ θɪŋk ðət ʃiːz raɪt/ — you can just as easily say "I think she's right"
- He said that he'd call. /hi sed ðət hiːd kɔːl/
- the man that called /ðə mæn ðət kɔːld/ — a relative clause pointing back to man, but that itself carries no stress
A test: can you delete it?
If you're not sure which version applies, there's a simple check: remove the word "that" from the sentence. Does the meaning survive intact?
- Yes, it survives → that is grammatical glue → say it weak, /ðət/, or skip it
- No, the sentence breaks or the meaning changes → that is the content → say it in full, /ðæt/
Try it on "I heard that you moved." Delete that: "I heard you moved" — still complete, still means the same thing. That version of that should be weak. Now try "I can't believe that." Here that refers to a specific event; you can't delete it. That version stays full.
Both versions can show up in the same sentence
- That's the book that I told you about.
- /ðæts ðə bʊk ðət aɪ təʊld juː əˈbaʊt/
The first that is the demonstrative — it means "that particular book," so it's stressed and full. The second that introduces the relative clause; it's grammatical glue, so it's weak — and it's droppable: "That's the book I told you about" works just as well. Same spelling, same sentence, one heavy and one light, and native speakers never confuse the two, because they were never processing it as "one word" in the first place.
How to practise it
Take any sentence with that in it and ask the deletion question first. If it can go, let it go — say it fast, weak, or not at all. If it can't, treat it like any other content word — book, like, restaurant — and give it its full shape. English stress was never assigned randomly; it tracks whether a word is actually carrying meaning. That just happens to be the word where you can watch the rule flip within a single sentence.
Can't tell which word in a sentence should be stressed and which should be reduced? PHONO reads any English text through your camera and marks every word with IPA — weak forms, linking, and stress included — with both US and UK audio.
Download: https://apps.apple.com/us/app/phono-english-phonetics-ipa/id6783243417 · phono.douhouse.com