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过去进行时的结构 过去进行时由“was / were + 现在分词”构成。如： I was doing my lessons then. 那时，我在做功课 We were cleaning the house. 我们在打扫房子。 (责任编辑：admin) |
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过去进行时的结构 过去进行时由“was / were + 现在分词”构成。如： I was doing my lessons then. 那时，我在做功课 We were cleaning the house. 我们在打扫房子。 (责任编辑：admin) |