He was singing loudly while driving to work.She was studying at the library when her phone rang.The children were playing in the backyard when it started to rain.They were walking home from school when they saw a squirrel crossing the street.The teacher was explaining a difficult concept to the students when the fire alarm went off.I was cooking dinner when my roommate walked in and asked for help.The cat was sleeping peacefully on the couch while the dog was chasing its tail.We were having a picnic in the park when a sudden gust of wind blew our food away.