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英语语法Combine the following pairs of sentences,using present o

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英语语法
Combine the following pairs of sentences,using present or past participle.
I have borrowed the book.The teacher has recommended it.
i have borrowed the book recommended by the teacher.
再问: 为什麼要用by? Combine the following pairs of sentences,using present or past participle. 1.He felt tired.He took a rest. Ans:Feeling tired,he took a rest.为什麼这句有逗号不用用by而 2.I have borrowed the book.The teacher has recommended it.这句要用by? 3.We were able to find the boy.He was hiding behind a tree. Ans:We were able to find the boy hiding behind a tree.而这句答案为是这样?
再答: 这个地方是被动式,省略为ed分词,被老师推荐 第一句的前半句是表示原因,后半句是结果,用逗号隔开 第二句也就是你的问题,是将it(即书)作为两句的结合点,原句是主动语态,it作宾语,连接时转化为被动语态,作完整的定语从句的主语i have borrowed the book (that has been )recommended by the teacher. 第三句也是用的主动语态的简略式ing结构,完整的定语从句是We were able to find the boy(who was hiding) /hiding behind a tree.主动语态不管是一般现在是还是现在进行时都用ing结构来替代
再问: Combine the following pairs of sentences,using present or past participle.意思是不是把状语从句改成非谓语从句?
再答: 将下列两句用现在分词或过去分词(形式)结合在一起