Japanese speakers
Mistake: Pronouncing "won't you" as two clear syllables, "WONTO YU", with a distinct t sound and a full [ju:] for "you".
Why: Katakana loanwords insert a vowel after final consonants and preserve "you" as a full-strength word rather than a reduced glide.
Fix: Merge t + y into the affricate [tʃ]: "won't you" becomes [ˈwoʊntʃu]. Then link "come" straight into "in": [ˈkʌmɪn]. The full invitation flows as [ˈwoʊntʃuˈkʌmɪn] — "wontcha cuh-min".
Korean speakers
Mistake: Keeping "you" fully articulated as [ju] out of politeness, since Korean formal speech tends to lengthen and clarify polite forms.
Why: In Korean, more careful articulation often signals more politeness, so learners resist reducing "you" even in casual invitations.
Fix: In English, the t+y coalescence to [tʃ] is standard casual pronunciation regardless of politeness level: [ˈwoʊntʃuˈkʌmɪn]. Warmth is conveyed through rising, inviting intonation, not through careful separate articulation of each word.
Chinese speakers
Mistake: Pronouncing "come in" as two separate words with a small pause and a released final m on "come".
Why: Mandarin syllables are typically produced with clear final boundaries, so learners keep "come" and "in" phonetically distinct.
Fix: Link "come" directly into "in" without releasing the m: [ˈkʌmɪn], almost like "cuh-min". Combined with the t+y merger in "won't you", the whole invitation becomes one smooth four-syllable phrase.