新概念英语第二册的第77课中的一句话The operation,which lasted for over four hours,proved to be very difficult because of the hard resin which covered the skin.proved to be very difficult,to在这里是作什么用,另外be加形容词

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新概念英语第二册的第77课中的一句话Theoperation,whichlastedforoverfourhours,provedtobeverydifficultbecauseofthehardre

新概念英语第二册的第77课中的一句话The operation,which lasted for over four hours,proved to be very difficult because of the hard resin which covered the skin.proved to be very difficult,to在这里是作什么用,另外be加形容词
新概念英语第二册的第77课中的一句话
The operation,which lasted for over four hours,proved to be very difficult because of the hard resin which covered the skin.
proved to be very difficult,to在这里是作什么用,另外be加形容词是不是表示一种状态?
另外那课后练习：It was difficult because of the hard resin ____the skin.这里为什么是covering,而不是covered?

新概念英语第二册的第77课中的一句话The operation,which lasted for over four hours,proved to be very difficult because of the hard resin which covered the skin.proved to be very difficult,to在这里是作什么用,另外be加形容词
The operation是主语,谓语部分是proved to be very difficult ,which lasted for over four hours为非限定性定语从句,to在这里是不定式的符号,短语prove to do something.BE +形容词表示性质、状态.之所以用covering不用covered是因为这里应该使用现在分词做后置定语,表主动含义,而用过去分词做定语表被动含义.It was difficult because of the hard resin covering the skin.=It was difficult because of the hard resin that/which covered the skin.（持续4个多小时的手术很难是因为覆盖在皮肤上的树脂）注意是说 the hard resin covered the skin.It was difficult because of the hard resin covered the skin.=It was difficult because of the hard resin that was covered the skin.注意the hard resin was covered the skin.这个句子是不成立的,应该说the hard resin was covered by/with the skin.但是句意又是不正确的.整句的意思成了手术很难是因为树脂被皮肤覆盖.

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