在of what is 处我找不到主谓宾了That means a higher proportion of what is in the sea is being caught,.
问题描述：
在of what is 处我找不到主谓宾了
That means a higher proportion of what is in the sea is being caught,.
答
that是形式主语。第二个is是谓语。
主句是That is being caught,........
means a higher proportion 是that的后置定语
of what is in the sea 是proportion 的后置定语
答
what is in the sea is being caught单独摘出来，what is in the sea这个从句是这句的主语，is being caught是这句的谓语部分。而摘出来的这句在that means...这个句子中可视为介词of的宾语。
答
That | means | a higher proportion of what is in the sea is being caught.这个是主语+谓语+宾语从句
A higher proportion of what is in the sea | is being caught.这个是主语+谓语,整体作为从句充当原句子的宾语.
a higher proportion of | what is in the sea 后者又是一个从句
what is in the sea 这里what就是主语