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英语语法,下面的句子怎样分清主谓宾语

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英语语法,下面的句子怎样分清主谓宾语
Screws which are operated for maintenance purposes shall not be of insulating material if their
replacement by a metal screw could impair supplementary or reinforced insulation.
英语语法,下面的句子怎样分清主谓宾语
Screws(主语)shall not be (谓语)of insulating material (介词结构做表语,此句无宾语).
which are operated for maintenance purposes (定于从句,修饰螺丝)
if theirreplacement by a metal screw could impair supplementary or reinforced insulation.(条件状语从句)