Question

two present participles in which the last letter is doubled

Answer 1

Answer:

There is a supposed 'rule' in American English that if the final syllable in a multi-syllable verb is unaccented/ unstressed/ un-emphasised, then the last letter of that syllable is _not_ doubled in forming the present participle - eg “worshiping”, “kidnaping” (compare to “shipping” and “napping”).

Answer 2

Answer:

HOP+ING=HOPPING

FLIP+ING= FLIPPING

DRIP+ING = DRIPPING

MOP+ING =MOPPING

FLOP+ING= FLOPPING

SOB+ING=SOBBING

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