bytheendof，prep.

到…结束时在…尽头

例句

The way things are going the company will be bankrupt by the end of the year.

从事态发展的情况看，到年底公司就得破产。

by是prep. 靠近通过被经由不迟于adv. 经过在旁边靠近

例句：

He hurried by and disappeared in the wood.

他匆匆走过去，消失在森林里。