"only"开头的句子在倒装时，通常会将助动词、情态动词或be动词放在主语之前。以下是一些倒装的基本规则和例子：
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1. 如果句子中有助动词（如can, may, must, shall, will, would, should, could等），它们会放在主语之前。
例子：
Only then did I realize how important it was.
Only after the party did I realize that I had left my phone at home.
2. 如果句子中有情态动词（如can, could, may, might, must, shall, should, will, would等），它们会放在主语之前。
例子：
Only by reading extensively can one improve their vocabulary.
Only if you work hard will you succeed.
3. 如果句子中有be动词（如am, is, are, was, were等），它们会放在主语之前。
例子：
Only after the movie were we able to leave the theater.
Only then was I aware of the situation.
当"only"位于句首时，通常是为了强调句子的某个部分，所以倒装的使用要确保句子的意义清晰，并且符合语法规则。
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