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分析一下only+状语(从句)+倒装句的列句成分!要非常详细.

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分析一下only+状语(从句)+倒装句的列句成分!要非常详细.
  [考题1] Only by keeping downcosts will Power Data hold its advantage over other companies.(2006浙江) 考题2] Only in this way can you hope to make improvements in the operating system.(2003上海春)   [考题3]Only with hard work can you expect toget a rise.(2001北京、 安徽春) 考题4 Only then did she realize how much damage had been caused.
这是"部分倒装",属倒装句的一种.只把谓语的一部分(多为助动词、系动词be或情态动词)置于语主之前的句子,叫部分倒装句.
1.only 修饰付词、介词短语或状语从句,且放在句首时.你举的这几个例句就是这样.第一、二、三句是only修饰的介词短语,放在句首;第四句是only 修饰付词放在句首.
2.在部分倒装句中,如果谓语部分无助动词,则须找助动词来“帮助”它构成倒装句.例如:
1)Only after the war learned he the sad news. X
Only after the war did he learn the sad news. 这就对了.
2)only 修饰状语从句时,从句不可倒装.如:
1)Only when did he retun did we find out the truth.X
正确的应该是:Only when he returned did we find out the truth.
3)only 修饰主语时,句子不到装. 如:
Only can he answer the question.X
正确的是:Only he can answer the question. 谢谢采纳!