Old books have ceased to be of service.be是系动词,of service是表语,那么have ceased 是谓语,怎么句中有两个谓语?能分析一下句子成分吗?

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Old books have ceased to be of service.be是系动词,of service是表语,那么have ceased 是谓语,怎么句中有两个谓语?能分析一下句子成分吗?

Old books have ceased to be of service.be是系动词,of service是表语,那么have ceased 是谓语,怎么句中有两个谓语?能分析一下句子成分吗?
Old books have ceased to be of service.
be是系动词,of service是表语,那么have ceased 是谓语,怎么句中有两个谓语?能分析一下句子成分吗?

Old books have ceased to be of service.be是系动词,of service是表语,那么have ceased 是谓语,怎么句中有两个谓语?能分析一下句子成分吗?
be of + 名词=形容词

动词不不定式应该作宾语吧。

be of + 名词=形容词