was were doing 是表示过去将来时吗

1。概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。2。时间状语：at this time yesterday,at that time或以when引导的谓语动词是一般过去时的时间状语等。3。基本结构 s+was/were+doing When he knocked at the door,his mother was cooking。4。否定形式：s+was/were + not + doing。When he knocked at the door,his mother was not cooking。5。一般疑问句：把was或were放于句首。(第一个字母大写）Was his mother cooking,when he knocked at the door?