only开头的句子,为什么有时候不用倒装

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only开头的句子,为什么有时候不用倒装

only后面跟状语时,放于句首,才倒装,修饰主语时,不到装.如:Only in the classroom can you do some readingOnly by exercising every day can you have a good bodyOnly he knows the truth.