Japanese speakers
Mistake: Pronouncing it as "KAMU ON" with a full [u] after "come" and a clear pause before "on".
Why: Katakana English preserves each word as a separate unit and blocks the m from linking onto the following vowel.
Fix: The m at the end of "come" links directly onto the o of "on": [ˈkʌˈmɒn]. Say it as one word, "cummon". The [ʌ] is short and unrounded, not the Japanese [a] or [u].
Korean speakers
Mistake: Producing a glottal reset between the two words, giving "KEOM ʔON" with a fresh vowel onset on "on".
Why: Korean prosody often inserts a light glottal stop before word-initial vowels, blocking the m-linking.
Fix: Let the m slide directly into the vowel with no break — [ˈkʌmən] or [ˈkʌmˈɒn] as a single flow. The whole thing sounds like one two-syllable word.
Spanish speakers
Mistake: Rounding the o in "come" to a Spanish [o], giving "KO-MON" — but English "come" has [ʌ], an unrounded central vowel.
Why: The Spanish letter o maps to [o]; English orthography does not, and "come" is a notorious exception (spelled with o, pronounced [ʌ]).
Fix: "Come" rhymes with "some" and "gum", not with "home" or "tone". Use [ʌ]: [ˈkʌmˈɒn]. Then link the m onto the o of "on".