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?the first thing 是状语吗

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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?
the first thing 是状语吗

the first thing 是I saw的定语,同时也是was a notice which said的主语,which不可去掉