for they greedily devoured what was left of the cake.请问,what was left of the cake,这句.里面的was是什么意思,在这里启什么作用

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for they greedily devoured what was left of the cake.
请问,what was left of the cake,这句.里面的was是什么意思,在这里启什么作用

what was left of the cake
was + left be 动词 + 动词的过去分词( leave) 表被动
例 The book is sold out.书卖光了
The building was built in 1989.大楼建于1989年.