句法结构the first thing I saw when i entered the art gallery was a notice which said;do not touch这里的was是什么作用啊,which可以去掉吗?

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句法结构the first thing I saw when i entered the art gallery was a notice which said;do not touch这里的was是什么作用啊,which可以去掉吗?

句法结构the first thing I saw when i entered the art gallery was a notice which said;do not touch这里的was是什么作用啊,which可以去掉吗?
句法结构the first thing I saw when i entered the art gallery was a notice which said;do not touch
这里的was是什么作用啊,which可以去掉吗?

句法结构the first thing I saw when i entered the art gallery was a notice which said;do not touch这里的was是什么作用啊,which可以去掉吗?
主体结构是the first thing was a notice
was是谓语,典型的主谓结构
中间的 I saw when i entered the art gallery都是修饰语
which修饰notice,这个定语从句里头which做主语,所以不能省

was在句子里作谓语。which是定语从句的引导词,不能去掉。

was 是句子的be动词 也就是谓语动词 是基本的句子成分
which在这里理论上来说是可以省略的 但是完全没有必要