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过去进行时的时间状语有: at this / that time yesterday, the whole evening, all day yesterday等。 试比较: He introduced Tom to us just now. 刚才他向我们介绍了汤姆。 She was doing some washing all day yesterday. 昨天她一整天都在洗衣服。 一般过去时的时间状语主要有： yesterday (morning, afternoon, evening), last night (week, month, year), ago, the day before yesterday, in 2003, just now, long, long ago等 Underline the correct form of the verbs. 1. Suddenly, all the lights in my house were going off / went off. There was heavy rain outside. 2. I called you up at seven 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. Oh, we showed / were showing several visitors around the school. 4c What were you doing at these times last Sunday? Fi