过去进行时+while+过去进行时; 一般过去时(-ed)+while+过去进行时(was/ were+doing)
过去进行时:was / were doing
过去进行时与一般过去时的区别
时态
过去进行时
一般过去时
结构 was / were +
-ed
用法
表示在过去某一时刻或某 一段时间正在进行的动作
表示已经发生的动作
then, at that time, this 时间状 time yesterday, at seven
语 yesterday evening, when, while
yesterday, just now, last day/ week/ month... ...ago; ...
过去进行时:was / were doing
特殊疑问句:特殊疑问词 + was/were + 主语 + V-ing + 其他 ?
1. I was reading a book at that time.(对划线部分进行提问) __W__h_a_t____ ___w_e_r_e____ you ___d_o_in_g____ at that time?
2. — I called you up at seven o’clock last night, but nobody answered it. — Really? I’m sorry, but I was teaching / taught a piano lesson at school.
3. — I was seeing / saw you and Tom in the library just now.