Close the windows well before going to bed.为什么before后要跟动词ing

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/05/30 02:05:59

Close the windows well before going to bed.为什么before后要跟动词ing形式?

动词加ing的原因有两个：一个是进行时态,另一个是变成“动名词”；
动名词的意思是单句没有主语,让动词变成名词.（上面的同学也说了一个最明显的提示,就是before 的介词,介词+动词时,动词必须加ing ）.
在这句话里,主语已经很明确（而且主从句的主语相同）,就是“这个人”/ 或者你自己（所以主语被省略掉了）,句意是：”在睡觉前,把窗户关了“ ；所以动词go 必须变成动名词going,让后面应该出现的从句(i go to bed)成为名词短语,而不是句子,这样才符合语法.

Close the windows well before going to bed.为什么before后要跟动词ing Close the windows well before going to bed.close为什么要用原型? 关于before( )the windows well before ( )to bed.用close和go的正确形式填 Be ----to close the windows before you leave. Students__________ to close the windows before they leave th I would take a long walk before going to bed.为什么go要用ing形式? I____(close)the windows before I leave. 用括号中所给动词正确形式填空 Please remember (close) the windows before yo Mother( )the room before she's going to bed. He usually c________ the emails before going to bed Don't forget to close all the windows before you leave the c We___to close the windows before we left the lab?A:tell B:to