英语语法How long does it take you to get to school? 此句中“it”是什么用法

英语语法How long does it take you to get to school? 此句中“it”是什么用法 how long does it take you to get from home to school?句中to ge How long does it take you to get to school How long does it take you to get to school? 原句 How long does it take you to get from home to school? does,take,how long,get,to,from,to,home,it,school,you(连词成句） you,long,to ,take,how,it,to,get,does,school,连词成句 How long does it take Tony to get to school. get to school by bike(?)=> how long does it take you to get How long long does it take you to get there how long does it take you to get from home to school 为什么加to How long does it take you to get from home to school?you后面咋没