I just find out that 'jumping' is not doubled P but 'mapping' is and really don't know the rule for this.
Further explanation links are welcomed.
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5Double the final consonant when adding -ing if the preceding vowel would otherwise change from short to long. Jumping still retains the short u sound; 'maping' would rhyme with 'shaping' if phonetic pronunciation rules were followed. 'Rap' -> 'rapping', which is different from raping. As with all things English, exceptions are not uncommon. – anongoodnurse Feb 03 '17 at 15:44
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2Why do you expect there to be a rule, or for words that are formed in similar ways to be spelled in similar ways? That's not how English spelling works. – jejorda2 Feb 03 '17 at 15:44
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What about bussing and busing? – John Lawler Feb 03 '17 at 16:51
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@JohnLawler - You don't know the difference between kissing and riding public transit? – Hot Licks Feb 03 '17 at 18:00
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How about busing and abusing, then? – John Lawler Feb 03 '17 at 19:44
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1Possible duplicate of Is there any rhyme or reason to when one should double the last consonant when adding -ed or -ing? – herisson Feb 03 '17 at 20:12
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If a verb ends with a letter sequence of consonant-vowel-consonant, double the final consonant.
JUMP: vowel(U)-consonant(M)-consonant(P) => Do not double the final consonant.
MAP: consonant(M)-vowel(A)-consonant(P) => Double the final consonant.
This rule exempts when h,w,x,or y is the final consonant. Those letters are not doubled.
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Moreover, the rule doesn't apply if the last syllable is weak (e.g. developing).
And when the last letter is C, you add a K (e.g. panicking).
– Rosie F Feb 15 '18 at 12:56