含有in ,on , at , up ,down ,befor ,for ,to ,by ,about ,of ,with...答:He went to school by bike, with his bag in hand.还可以引导伴随状语。by有“被”的意思,还有"使用.."的意思,如:by bike 更有一些特定的词组,如by chance, by accident,这里可以解释为“由于”。about 就是关于的意思。如"talk about" "think about"之类。有时也用来引导一个句子。