by the way, on the way, in the way
(1)by the way 常用作狀語,意為"順便問一下","順便說一下"。
By the way, how old are you?
順便問一下,你多大了?
(2)on the way "在……的路上",后接名詞時需加介詞to,后接副詞home、here、there時不加to。
He bought a pen on his/ the way to school.
他在上學的路上買了一枝鋼筆。
(3)in the way "擋路、妨礙"。
Your car is in the way.你的小汽車擋路了。