Common mistakes by native language
Japanese speakers
Mistake: Pronouncing the full consonant cluster [st] in "last" clearly and inserting a small release before "night", producing something like "las-to night" instead of the natural elided form.
Why: Japanese phonology avoids consonant clusters and typically breaks them up with vowels, so learners over-articulate English clusters like [st] rather than simplifying them the way natural connected speech does.
Fix: Drop the [t] between [s] and [n]: "last" plus "night" becomes [ˈlæsˈnaɪt] in General American. The [s] flows directly into the [n] of "night" with no stop consonant between them.
Korean speakers
Mistake: Inserting a glottal stop or a short vowel-like transition between the [s] of "last" and the [n] of "night", keeping the [t] audible as a separate closure rather than eliding it.
Why: Korean syllable structure discourages complex consonant sequences across syllable boundaries, so learners often add a transitional element rather than simply deleting a consonant the way English elision requires.
Fix: Practice saying "last night" with the middle [t] completely silent: [ˈlæsˈnaɪt]. Feel the [s] and [n] sit right next to each other with no consonant or vowel between them.
Chinese speakers
Mistake: Pronouncing "last" with a fully released final [t] before starting "night", so the phrase sounds like two crisply separated words: "last" [t] "night".
Why: Mandarin syllables generally end in a vowel or nasal, not in complex clusters, so when learners do produce an English cluster like [st], they often add a small release afterward rather than eliding the middle stop entirely.
Fix: Simplify the cluster by dropping the [t] between [s] and [n]: the whole phrase becomes [ˈlæsˈnaɪt]. Practicing common expressions like "I slept badly last night" helps this deletion become automatic.
Notes
"Last night" is an extremely common time expression, and its natural pronunciation, [ˈlæsˈnaɪt] in General American ([ˈlɑːsˈnaɪt] in RP, reflecting the trap-bath vowel split), involves a classic case of t-elision. The word "last" ends in the consonant cluster [st], and when the following word "night" begins with another consonant, [n], the middle [t] is dropped entirely rather than pronounced as a separate stop. The result is that the [s] of "last" flows directly into the [n] of "night" with no [t] audible in between. Learners who fully articulate the [t] will sound overly careful and add an extra beat to a phrase that native speakers compress automatically. Because this B1-level phrase is used constantly to talk about recent events — "I slept badly last night", "we met last night" — and because the same consonant-cluster simplification appears throughout English whenever a [t] or [d] sits between two other consonants, mastering the elision here builds a widely applicable listening and speaking skill.