life sometimes seems designed to exhuast our supply.句子结构怎么分析的?

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life sometimes seems designed to exhuast our supply.句子结构怎么分析的?

这是个主语 +系动词+表语的结构
主语life
系动词seems
表语designed to exhuast our supply
其实,如果把seems换成is你就好理解了,它俩性质一样,就是意义不同.
看句子life is designed to exhuast our supply.是不是理解没有一点问题?
一样的道理~^ ^