Common mistakes by native language
Japanese speakers
Mistake: Pronouncing it as "REFUTO TAAN" with a full [t] release for both t's and syllable breaks.
Why: Katakana English preserves each consonant with a supporting vowel and cannot easily simplify [ft + t] clusters.
Fix: The t of "left" is elided before the t of "turn": [ˈlɛfˈtɜːrn] (or in slow speech, a held single t). Say "lefturn" as one prosodic unit.
Korean speakers
Mistake: Producing both t's with clear aspirated release, giving "LEFT TURN" with staccato feel.
Why: Korean ㅌ carries aspiration and prosody favors clear boundaries.
Fix: Elide the t of "left": [ˈlɛfˈtɜːrn]. The [ft + t] cluster simplifies to [f + t] naturally. In driving contexts, this is a standard command spoken as one unit.
Spanish speakers
Mistake: Producing the r of "turn" as a tapped/trilled Spanish r, and preserving both t's.
Why: Spanish r is [ɾ] or [r]; Spanish rarely elides consonants at boundaries.
Fix: English r is [ɹ] (approximant, no tap): [ˈlɛfˈtɜːrn]. Elide the first t. In RP, the r may soften: [ˈlɛfˈtɜːn].