story: Harold went for a long bike ride. He had a flat tire about five miles from home. Harold did not know how to fix a flat tire. He had to walk all the way home with his bike. After he got home, Harold taught himself how to fix a flat.
 selected sentence: Harold did not know how to fix a flat tire.
Harold doesn't learn how to fix a flat tire >Causes/Enables> Harold doesn't know how to fix the flat tire