him once offering 如果改成 his once offering 也正確。　　動名詞的復合結構：凡是一個動詞的后面可以加動名詞，就可以加動名詞的復合結構。　　動作發出者 + 動名詞；當動作發出者名字給出時：名詞所有格 + 動名詞；當動名詞的復合結構在文章中出現，且動作發出者在前文中提過時：形容詞物主代詞（賓格）+ 動名詞。　　形容詞物主代詞：his, her, my, your, their, our。代詞賓格：him, her, me, you, us, them。　　第二點：want 想要； want to do sth. 想做某事； want doing 客觀需要或缺乏。　　48. Your hair wants _B_. Youd better have it done tomorrow.　　A cut B cutting C to cut D being cut　　注意：want doing 中doing表示的是被動含義。　　18. This room is so dirty that it wants _A_.　　A cleaning B to clean C being cleaned D cleaned　　第三點：mean 意味； mean to do sth. 打算做某事，意欲 ；mean doing 意味著，的意思是