How to pronounce "must be" in English — Connected Speech Guide (IPA /ˈmʌsbi/)

How native English speakers pronounce "must be" (IPA /ˈmʌsbi/) — connected speech rule, example sentences, and audio for GA and RP. Free. t dropped before b

must be pronunciation (IPA /ˈmʌsbi/) — Elision

What happens in this phrase

t dropped before b

Example sentences

It must be a mistake.
He must be home by now.
There must be a reason.
That must be the answer.

Common mistakes by native language

Japanese speakers

Mistake: Pronouncing every consonant fully as "MASUTO BI", inserting a vowel after the t and articulating the t clearly.

Why: Japanese CV phonotactics require a vowel after every consonant, and spelling-based learning preserves the t.

Fix: The t in "must" is completely elided before "be". Say [ˈmʌsˈbiː] — the s links directly to the b with no t audible. Native speakers do not perceive this as sloppy; it is the default.

Korean speakers

Mistake: Preserving the t of "must" with a clear release, giving "MASEUT BI" with a visible boundary between the two words.

Why: Korean allows complex codas and typically releases final consonants audibly at word boundaries.

Fix: Drop the t entirely. English clusters like [stb] are simplified to [sb] in fluent speech: [ˈmʌsˈbiː]. Try saying "muss bee" and you have it.

Spanish speakers

Mistake: Simplifying "must" to "mus" but keeping a Spanish-style [b] (fricative [β] between vowels) for "be".

Why: Spanish b between vowels is a soft fricative, not a full stop. Learners transfer this to English word boundaries.

Fix: Elide the t (correct: [mʌs]), but keep the English b as a clean stop: [b], not [β]. The result is [ˈmʌsˈbiː] with two clear consonants at the boundary.

Similar phrase patterns

next day — t-elision before another consonant: Same t-elision rule: [ˈnɛksˈdeɪ]. Any word ending in consonant + t followed by a consonant tends to drop the t.
last night — t-elision before /n/: The t in "last" disappears the same way: [ˈlæsˈnaɪt]. Systematic across the language.
just be — t-elision before /b/: Identical structure to "must be": [ˈdʒʌsˈbiː]. Once you hear the pattern in one, you hear it everywhere.

Practice sentences

You must be tired after that long trip. (empathetic guess)
This must be the right address. (confident inference)
It must be nice to work from home. (envious remark)
She must be almost done by now. (estimation)
There must be some mistake — I never ordered this. (polite complaint)

Notes

"Must be" showcases English t-elision at a clean word boundary: the t of "must" drops entirely before the b of "be", giving [ˈmʌsˈbiː]. This is not casual laziness — it is the default in every register except the most careful, formal speech. The rule generalizes: any consonant + t + consonant sequence at a word boundary tends to lose the t, producing families like "just be / just do / just go", "last night / last week / last time", and "next day / next week / next month". Modally, "must be" is one of the most common ways English expresses confident inference ("you must be tired" = "I'm sure you are tired"), distinct from its obligation meaning ("you must be quiet"). Both meanings pronounce identically — context does the disambiguation work.