exploding-->是the gas tank 的修飾,原句應該還原為 the gas tank which exploded knocked the men down. 然後把which exploded 的which省略 再把exploded 先還原成原型再加ing 至於加ing要去e這個大大應該知道 這種改法我沒弄錯的話應該是叫做分詞構句 但確定是可以這樣改的 ,如果今天修飾的 動詞是被動的話,那省略關代後直接用被動式 例如: The car which was stolen by the thief cost lots of money.→ The car stolen by the thief cost lots of money.