# 1คำตอบสั้นShe _______ (read) a book when the doorbell rang.She was reading a book when the doorbell rang.
# 2คำตอบสั้นThey _______ (play) basketball at 3 p.m. yesterday.They were playing basketball at 3 p.m. yesterday.
# 3คำตอบสั้นI _______ (watch) TV while my mom was cooking.I was watching TV while my mom was cooking.
# 4คำตอบสั้นHe _______ (write) a report when his boss called.He was writing a report when his boss called.