Ответ:
1. Добавляем -ing к словам:
- a. stop — stopping
- b. play — playing
- c. eat — eating
- d. go — going
- e. cross — crossing
- f. fight — fighting
- g. think — thinking
- h. run — running
- i. shop — shopping
- j. fly — flying
- k. draw — drawing
- l. write — writing
