新概念英語第一冊語法總結：過去進行時大綱
過去進行時
——表示過去正在進行的動作，經常用在when, while, as引導的狀語從句中。
結構：was/were+doing
When my husband was going into the dining room this morning, he dropped some coins on the floor.
Their father was watching TV while they were having dinner.
★變疑問句將be動詞移到句首
Was their father watching TV while they were having dinner.
★變否定句在be動詞後面加 not
Their father was not watching TV while they were having dinner.
