read, reading, readding, swim, swiming, swimming, text, textting, texting, walk, walking, walkking, smile, smiling, smileing, hum, huming, humming, skip, skiping, skipping, sleep, sleeping, sleepping, time, timeing, timing, ask, asking, askeing, run, running, runing, have, having, haveing, sort, sorting, sortting, fill, fillling, filling, build, buildeing, building, add, adding, ading, carry, carryying, carrying, feed, feeding, feedding, phone, phoning, phoneing, grab, grabing, grabbing, care, careing, caring, cut, cuting, cutting, line, linning, lining, pop, popping, poping, slip, slipping, sliping, grin, grining, grinning, try, triing, trying, type, typing, typeing, write, writing, writting, build, building, buildding

'ing' rules

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