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oftheproperadverbialclauseSummary1：过去分词作状语，可以表示时间、原因、条件、让步、伴随或方式等，主句的主语与过去分词构成了逻辑上的被动关系，表示动作已完成。Task2观察句子，然后总结状语从句如何改为过去分词作状语。Summary2：★过去分词作时间、条件等状语时，可由对应的状语从句转换而成，可以在其前面加保留whe
，because，if等连词，即“连词过去分词”结构，使状语更加明确。Task3观察句子中过去分词的用法，然后加以总结。1Whe
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fSummary4：如果句子的主语和分词是主动关系用现在分词，句子的主语和分词是被动关系，用过去分词。1Completethese
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