After start, begin, keep, stop and continue, write the next verb with -ing.

• • Mia started sewing a mitten after lunch.
• • The boy keeps asking questions about the soft fleece.

Start, begin and continue can also use to + verb with the same meaning. But keep ONLY takes -ing. Stop to do means you pause in order to do something else.

• • The farmer continued shearing the sheep until dark.
• • We began to learn how to spin warm yarn.

Keep and continue mean that the action goes on or happens again and again. Stop means the action ends.

• • He stopped knitting when his hands felt tired.
• • Please do not stop singing while we wind the yarn bundle.

For a short verb ending in 1 vowel + 1 consonant, double the last letter before -ing (run → running). If a verb ends in -e, drop the e before -ing (make → making).

• • She keeps making mittens from thick yarn.
• • The dirty fleece is shrinking in hot water.