at the end of,in the end,by the end of,on the end of的区别,如果还有关于end的词组请都说一下具体详细一点哈,初中应掌握的水平

at the end of ...... 位置
in the end 事情、故事等表示结果
by the end of ...... 时间
on the end 时间——时间点（on the end of July......) 位置——终端（on the end of the other line......)

in the end =at last = finally,表时间,"最后"
at the end of the road,表地点,"在路的尽头"
at the end of the class,at the end of the day,表时间,"在要下课的时候","在一天要结束的时候"
by the end of next week,表时间,后跟将来时间,用将来时态.
we will finish the project by the end of next week.我们将在下周末完成这个方案.
by the end of last year ,表时间,后跟过去时间,用过去完成时态.
We had learnt 20 English songs by the end of last year.到去年底为止,我们已经学了20首英文歌.