将来完成时+by the time+一般现在是 结构 造个句子!

I will have finished the homework by the time my mom comes back
I had finished my homework by the time he knocked the door.
再问： 除了这个结构，by the time还有别的用法吗？？
再答： by the time 也不一定配合完成时., The dinner was through by the time the guests arrived