Teachers must put the brakes on,as it were,when they notice

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/08 19:29:32

Teachers must put the brakes on,as it were,when they notice students looking puzzled.
请问这句话的语法结构如何理解?
look为什么要加ing?

put something on中的on是宾补
as it were是插入语
looking puzzled也是宾补
宾补是在宾语后起修饰作用的
之所以用look+ing是因为look在这里不能当谓语（主句是they notice students.其中notice是谓语,一句话中不能有双谓语）所以用非谓语动词中的动名词形式looking.

Teachers must put the brakes on,as it were,when they notice when were the first CDs put on the market When is the notice put up ?是什么意思 They would put it beside their bed at night,on the seat when When they put they must have when will the notice be put up 和when the notice will be put 英语翻译A new supermarket put on a notice inside the entrance.It All the teachers and students were tired when they ___the to he is put up the notice on the wall when we were young,the parents and teachers toid us that it 英语句型问题 When they were trying to put out the fire, The children were left of a neighbor when they were on holid