Nothing, add -ing: pass, passing, growl, growling, spell, spelling, read, reading, talk, talking, drop the e, add -ing: close, closing, write, writing, use, using, hike, hiking, move, moving, double final consonant, add -ing: swim, swimming, quit, quitting, hum, humming, jog, jogging, bat, batting,

Adding -ing Endings

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