关于 be 注意这个句子At the beginning of class,the noise of desks being opened and closed could be heard outside the classroom.关于句子成分分析我还是懂一点的（也请高手帮我分析一下这个句子）,就是不知道这个b
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关于 be 注意这个句子At the beginning of class,the noise of desks being opened and closed could be heard outside the classroom.关于句子成分分析我还是懂一点的（也请高手帮我分析一下这个句子）,就是不知道这个b
关于 be
注意这个句子
At the beginning of class,the noise of desks being opened and closed could be heard outside the classroom.
关于句子成分分析我还是懂一点的（也请高手帮我分析一下这个句子）,就是不知道这个be(在heard前面的那个）怎么理解怎么用.
希望得到详细的回答
关于 be 注意这个句子At the beginning of class,the noise of desks being opened and closed could be heard outside the classroom.关于句子成分分析我还是懂一点的（也请高手帮我分析一下这个句子）,就是不知道这个b
heard之前的be 是作为被动来用的
把这个句子简化后就变成了：The noise could be heard (outside of the classroom).意思就是：在教室外面可以听到噪音,也就是在教室外面噪音可以〈被〉听到.
我们可以把这个句子一层一层的剥开
1.At the beginning of class,the noise of desks being opened and closed could be heard outside the classroom.
2.the noise of desks being opened and closed could be heard outside the classroom.
3.the noise of desks could be heard outside the classroom.
4.the noise could be heard outside the classroom.
5.the noise could be heard
希望对你有所帮助^-^
being opened 被动式的进行时，be heard 被动式，could 后面跟动词原形，就成了be heard 了！
be heard 是被动语态.因为是跟在could后面,所以be只能用原形而不是are
课前，教室外面都能听到课桌开关的喧闹声
be在这里可以这么理解
the noise was heard by teacher
是被的意思
being强调动作持续不断地发生
be heard表被动，被听到