怎样判断这个词是做介词还是副词比如She slipped and fell down the stairs,hurtin

怎样判断这个词是做介词还是副词比如She slipped and fell down the stairs,hurtin I slipped on the stairs and fell down,___ breaking my leg 英语翻译"slapped her and she slipped and fell down in the water" she rushed down the stairs down是副词还是介词 it sent sparks down to the ground...请问down在此是介词还是副词啊?怎么判断? She fell down the porch and I couldn't ____her. he was running downstairs_____he slipped and fell to the gro I slipped on the ice and fell over. 副词和介词的区别turn down the radio中的down是副词还是介词,get on the bus中的on是 是The building is fell down还是The building fell down?为什么? fell down 与fell to的区别 比如 Fell down the ground 与 fell to the