y bike和on a bike是介词短语,而ride a bike 是动词短语.两者虽然意思一样,但是在句子中充当的成分不同.举个例子,I go to school by bike=I go to school on a bike=I ride a bike to go to school.在这里,介词短语（by bike 和on a bike）作状语,而动词短语（ride a bike）作的是谓语.
on a by bike可以替换成on a bike.为神马不是可替换成ride a bike
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