Be ill,she went home.和Having finished their work ,they had a rest

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Be ill,she went home.和Having finished their work ,they had a rest

Be ill,she went home.和Having finished their work ,they had a rest
Be ill,she went home.和Having finished their work ,they had a rest

Be ill,she went home.和Having finished their work ,they had a rest
Be ill = She was ill.
Having finished their work 做完成分词引入的状语,表示该行为在主语行为之前完成.
可以看做为:Since they had finished their work,they had a rest

前半句是状语从句的省略形式,分别用系表结构和动词短语充当状语

第一句应该是状语从句的省略,完整的是she was ill
第二句逗号前是状语成分“现在分词的完成式作状语”,逗号或是完整的句子。