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过去进行时 1）过去进行时的构成： was / were +v-ing 2) 过去进行时的用法： 过去某一阶段或某一时刻正在进行的动作。 例如： This time last year I was living inBrazil. What were you doing at 10 o'clock last night? 3)常用于过去进行时的时间状语： at four yesterday afternoon，then，at that time/moment 等。 例题解析：举一反三，学的更轻松！ | 
