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?

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Teachersmustputthebrakeson,asitwere,whentheynoticestudentslookingpuzzled.请问这句话的语法结构如何理解?look为什么要加ing

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?
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?

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.

notice后面带ing形式，表正在进行的状态，跟see.find用法一样

when they notice students looking puzzled,这里谓语是notice，而looking是修饰students的。这个句子可以改成：when they notice students who look puzzled.

这句话的意思是，当学生看上去很疑惑的时候。。。。。
就因为这个when，所以要用ing

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