in the end 可單獨(dú)置于句首和句尾,表示在最后.
by the end 和 at the end 后面一定要加of
用法：
1 、by the end of 是“到.末”的意思,后邊跟不同的時(shí)間會(huì)有不同的含義和用法.
A 跟將來(lái)的時(shí)間,就用一般將來(lái)時(shí),如
By the end of next month,I will finish reading this book.(到下個(gè)月末,我將讀完這本書(shū)）.
B 跟現(xiàn)在的時(shí)間,就用現(xiàn)在完成時(shí),如
By the end of this week ,I have written two books .(到這個(gè)星期末,我已經(jīng)寫(xiě)了兩本書(shū)了）
C 跟過(guò)去的時(shí)間,用過(guò)去完成時(shí)
By the end of last month ,I had planted thousands of trees.(到上個(gè)月末,我已經(jīng)種了數(shù)千棵樹(shù)了）
2 、at the end of 后邊可以跟時(shí)間和地點(diǎn)名詞,表示“在.末" 如at the end of this month 在這個(gè)月末,at the end of last month ,at the end of next month ,at the end of the road 在路的盡頭 等at the end of 后又各加什么時(shí)態(tài)呢？at the end of沒(méi)有需要講明的時(shí)態(tài)用法。時(shí)態(tài)根據(jù)需要來(lái)定。
e.g.
I will finish reading this book at the end of this month.

我計(jì)劃在月底前讀完這本書(shū)。
At the end of the football match, we sored and won with 1-0.
在足球比賽的最后階段，我們成功得分并且以1比0獲勝。