story: I've a friend who is pretty ill so I thought it best to call him. I called him over and over yesterday but he didn't answer. So I began to worry. Then wouldn't you know it he called me! So now I know my friend is OK and so I won't worry any more.
 selected sentence: I've a friend who is pretty ill so I thought it best to call him.
I feel(s) concerned >Motivates> I think it best to call him