story: Bob had always been afraid of spiders. He decided that he didn't want to be afraid anymore. Trying to face his fear, Bob went to a pet shop to buy a tarantula. When he got to the pet shop, but they didn't have any spiders. Bob is still afraid of spiders, but now he owns a parrot.
 selected sentence: Bob had always been afraid of spiders.
Bob is afraid of spiders >Causes> Bob feel(s) worried