英语固定句型不可以分开的吧

你完全理解错误了

没错 过去将来完成时态是 would have done

在He said he would let me have the book as soon as he had read it.中，would 是will 的过去式，但是 let somebody do something 是一个动词词组，也就是说let me have 这个let的动词词组的have 与前面的would并不构成过去将来完成时态。 是would let 构成 过去将来时。