This is not such a good engine as I expected to be.关系代词as

题目

This is not such a good engine as I expected to be.关系代词as
This is not such a good engine as I expected to be.这里关系代词as代替engine?在定语从句里做什么成分?定语从句为什么要加to be而不是as I expected?

答案

是的,指代 engine,作从句的宾语.从句中的 to be 是宾语补足语,即 I expected the engine to be good.
此句意思是：这个发动机并不是像我期待的那样好.也可译成“这不是一个如我期待得那么好的发动机”.