第1个回答 2013-03-10
doing:finsh,practice,enjoy,spend,mind,find,stand,keep 所有介词,如at,for,on,about,词组:think about,decide on,be good at,thanks for,how about,do well in,be interested in,be busy,have fun,have a good time,go doing,do some doing 动词做主语时
to do:decide,plan,need,would like,want,agree,hope,afford表目的时,作表语,定语后置,作主语
两种情况:help/begin/start/hate/dislike/like/love,stop/forget/remember(两种情况下表示意义不同), feel/listen/hear/look/see/notice/watch(to do表示一般现在时,doing表正在发生,现在进行时)
抱歉,只知道这么多,希望对你有用