they ___(fix) up machines when i came into the workshop 为什么是 were fixing?
问题描述：
they ___(fix) up machines when i came into the workshop 为什么是 were fixing?
he said he ___(clean)up the city parks if it didn't rain.为什么是would clean
it's not only a chance but alsi a challenge for him __(get) this job 为什么是to get
when i was young,i often ___(go) swimming in that big river.为什么是went
the medicine must ____(keep)away from children.为什么是be kept
帮我分析一下
答
第一句when 引导,因为修理机器漫长的过程不是瞬间动作
第二句 if 为条件状语从句,主句用将来时前面有said,will改为would
第三句 凭据语感好吗 对他来说是一个挑战去得到这个工作
第四句 过去式咯,过去常常游泳
第五句 被动语态这个药必须被远离孩子们,药物是被动的
求采纳么么哒