Review the item:
After listening for weeks to her boyfriend Steve bragging about his mother's
chili,
Amy anticipated the first delicious spoonful, the hair floating among
the beef and beans, however, killed her appetite.
After listening for weeks to her boyfriend Steve bragging about his mother's chili is a present participle phrase. A present participle phrase will begin with an ing word like listening. A main clause follows the participle phrase: Amy anticipated the first delicious spoonful. When a participle phrase introduces a main clause, you must separate the two with a comma.