story: Tom was skiing for the first time. He was going very well staying up on his skis. So he was allowed to take the T-bar up to one of the small hills. He was afraid he wouldn't be able to get off when it reached the top. He was a little shaky, but he got off the t-bar without falling.
 selected sentence: He was afraid he wouldn't be able to get off when it reached the top.
Tom worries about getting off the T-Bar >Causes/Enables> Tom shakes while getting off the T-bar