story: Emma had been trying to pull her loose tooth out for days. She was afraid to pull it quite hard enough to get it out. Her parents kept trying to let them help but she said no. One evening her brother gave her a wad of bubblegum. She felt a tug as she was chewing as her tooth came out in the gum.
 selected sentence: Emma had been trying to pull her loose tooth out for days.
Emma want(s) to pull >Motivates> Emma tries to pull