what are you doing for vacation?与 when are you going on vaca

what are you doing for vacation?与 when are you going on vaca What are you going for vacation?和Where are you doing on vaca what are you doing for vacation?和what are you going for vaca What are you doing for vacation?同义句What are you＿＿do for vaca what are you doing for vacation What are you doing for vacation? what did you do on vacation和what are you doing for vacation有 what are you going on vacation what will you do for vacation 与 what are you doing `````` what are you doing for vacation?为什么要用for不用on what are you doing for vacation?可以用On替换for吗 what are you doing for vacation .为什么用介词for 而不用on?