we found the house easily with the old man's leading the way.we（主）found（謂）the house(賓）easily(狀）with the old man's leading the way(狀）這個(gè)結(jié)構(gòu)中the old man's(不用加's)應(yīng)該是 with the old man...為什么這個(gè)結(jié)構(gòu)中the old man's(不用加's)加's就是所有格了。在這個(gè)結(jié)構(gòu)中，leading是賓補(bǔ)，是現(xiàn)在分詞充當(dāng)賓補(bǔ)，不是動(dòng)名詞充當(dāng)賓語，所以，就不能加's。動(dòng)名詞充當(dāng)賓語時(shí)是可以加的。比如：He suggested the old man's leading the way.(他建議老人帶路)