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 reading
Only by exercising every day can you have a good body
Only he knows the truth.
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 reading
Only by exercising every day can you have a good body
Only he knows the truth.