They have prover themselves to be of great commercial value里面的to be 后面为什么用of?

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They have prover themselves to be of great commercial value里面的to be 后面为什么用of?
They have prover themselves to be of great commercial value里面的to be 后面为什么用of?

They have prover themselves to be of great commercial value里面的to be 后面为什么用of?
be of + 抽象名词表示主语具有该抽象名词的特点、性质等等.
上句的value为抽象名次,该句的意思是:它们已经证明了其极高的商业价值.句中的prover应该是proven.
再如:
I hope that I can be of some help.我希望我能有所帮助.

of 后面加名词,如of great importance,就相当于一个形容词,就是important的意思.
在本句中,of great commercial value意为very valuable at the aspect of commerce.