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动作或存在的状态。
过去进行时
2. 在过去某段时间一直在进行的动作
(a) From 1983 to 1998, he was teaching
at No.3 Middle School.
(b) They were building a bridge last
winter.
(1) 基本结构：was / were + verb-ing
(2) 否定式：was / were not + verb-ing
was not = wasn’t were not = weren’t
— Hey, look where you were going.
喂，看你上哪儿了。
— Oh, I’m very sorry. I wasn’t noticing.
噢，实在对不起。 我刚才没留神。
(3) 疑问句：was / were调到主语前
结构为：Was / Were + 主语 + verb-ing?
回答：Yes, 主语 + was/were.
No, 主语 + was not/wasn’t.
were not/weren’t.
— Were you having dinner at six last
night? 昨晚六点钟你是在吃晚饭吗？
— Yes, I was. 是的，我是。
标志词：
when , while , at that moment（在那时) ,
at nine o’clock last night（昨晚9点钟）,
at that time ，this time yesterday等
A Linda was helping at a charity event last Saturday. Read her schedule and complete the sentences below using the past continuous tense.
when, while都有“当……时候”的意思。
Past continuous tense with
‘while’ , ‘when’