【定语从句介词提前和不提前怎么分呀Thisisthequestionaboutwhichwevehadsomuchdiscussion.Haveyoumetthepersonthathewasspeakingabout.这两句都是定语从句.从句中一个是discussionabout,一个是speakingabout.为】

　　定语从句介词提前和不提前怎么分呀

　　Thisisthequestionaboutwhichwevehadsomuchdiscussion.

　　Haveyoumetthepersonthathewasspeakingabout.

　　这两句都是定语从句.从句中一个是discussionabout,一个是speakingabout.为什么前一句把about放到了关系代词which前,而后一句不动?如果改成Thisisthequestionwhichwevehadsomuchdiscussionabout.

　　Pleasewaitforme!wait作谓语，而please和forme做什么语呢？