Japanese speakers
Mistake: Pronouncing each word fully as "TAAN ITTO ON" with three separated words.
Why: Katakana English preserves each syllable; the flap-t + n-linking chain is unfamiliar.
Fix: The n of "turn" links to "it", the t of "it" flaps between vowels, and "it on" continues linking: [ˈtɜːrnɪɾɒn]. Say "turnidon" as one prosodic unit.
Korean speakers
Mistake: Producing clear boundaries between all three words with aspirated [tʰ].
Why: Korean prosody keeps word boundaries clean.
Fix: 3-word phrasal verbs like this compress into a single stress group: [ˈtɜːrnɪɾɒn]. The t flaps; the r/n link naturally. In RP, the r may soften: [ˈtɜːnɪɾɒn].
Spanish speakers
Mistake: Producing tapped/trilled Spanish r, and preserving each word separately.
Why: Spanish r is different, and Spanish rarely fuses across word boundaries this heavily.
Fix: English r is [ɹ] (approximant). The whole 3-word phrase compresses: [ˈtɜːrnɪɾɒn]. Same rhythm as "pick it up" [ˈpɪkɪɾʌp].