As is known to everyone, the moon travels round the earth once every moth.
实在搞不明白,as既然是代替逗号后面的内容,那么他不就跟 It is know to everyone that ...完全一样了吗?为什么还称他是非限制定语?
The silence was suddenly broken when a large car,with its headlings on and its horn blaring,roared down the arcade.请问老师,with部分作句子的什么成分,可以看作car的定语么(为什么加那么多逗号)? 它的主句部分是 when a large car roared down the arcade 吗?