要注意的是在本句是ago是用在由since引起的从句之中，只是从句应用过去时，但...，since,ago,单词记忆法、语法用法，与since,ago, 相关例句、名人名言

since单词相关例句：

I have long since abandoned the notion that higher education is essential to  either success or happiness. Hot houses of learning do not always grow anything edible.Robert Moses, American state govenment officer——我早已抛弃了这种观念：高等教育是通往成功或者幸福的必由之路。知识的“温室”并不总能生长可供食物用的粮食。美国州政府官员  摩西  R
The laws of Nature, that is to say the laws of God, plainly made every human being a law unto himself, we must steadfastly refuse to obey those laws, and we must as steadfastly stand by the conventions which ignore them , since the statutes furnish us peace, fairly good government and  stability, and therefore are better for us than the laws of God, which would soon  plunge us into confusion and disorder and anarchy if we should adopt them.Mark Twain, American  writer自然法即神灵法，只是用来约束每一个个体的法律，我们必须坚定地拒绝遵守。我们应该坚定地遵守忽视神灵法的规章制度，因为规章制度赋予我们和平、比较好的政府和稳定，因而对我们来说，规章制度比神灵法更好，因为如果我们采用神灵法的话，他会将我们陷入迷惑、无序和无政府状态。美国作家   马克·吐温A
Be not angry that you cannot make others as you wish them to be, since you cannot  make yourself as you wish to be.Thomas Mann, German writer——不要由于别人不能成为你所希望的人而愤怒，因为你自己也不能成为自己所希望的人。德国作家  托马斯·曼

The United States is a republic, since its citizens elect people to represent it.
美国是共和制，因为每个公民都能选人去代表他们。


I'm lame since my accident; I need the help of my arms to walk.
事故之后我就瘸了，我需要手来帮助我走路。


Primitive men made fire by themselves since they had no electricity.
原始人不能用电，只能自己生火。


Ever since she started her diet, she has had a very slim figure.
她的身材自从节食开始就很苗条了。


Great changes have taken place in China since the introduction of the reform and opening policy .
改革开放以来，中国发生了巨大的变化。


They greet each other out of manners, since they are just acquaintances.
他们招呼对方是出于礼貌，因为他们只是泛泛之交。


I like the white sheet since it looks clean.
我喜欢这个白床单，因为它看起来很干净。

ago单词相关例句：

These palaces record were copied out three and a half thousand years ago by an egyptian scribe.

这些宫廷的记录是三千五百年前一位埃及的抄写员抄出来的。

From the point of view of evolution, men originated millions of years ago from the anthropoid, a species commonly referred to as the ape man.

从进化的观点来看，人类起源于几百万年前的类人猿，通常又称作猿人。

The warranty lapsed two months ago .

那项保证两个月前失效了。

直接引语 间接引语 now then ago before today that day this morning that morning yesterday the day before yesterday morning the morning before tomorrow the next day,the following day,the day after last week(month,etc) the week(month,etc) before next week(month,etc) the week(month,etc) after,the following week(month,etc) this week(month,etc) that week(month,etc) here there "I'll come and see you again this evening,Tom."he said.
直接引语 间接引语 this that these those now then ago before/earlier today that day yesterday the day before tomorrow the next/following day the day after tomorrow In two day’s time come go here there the day before yesterday two days before/earlier
yesterday the day before two days ago two days before
this day week 意为“一周后的今天”，类似地，this day year 则表示“一年后的今天”。比较：six months ago today 的意思是“半年前的今天”，10 years ago today 的意思是“10年前的今天”。
Many years ago there lived an old man in the wooden house.
It was about 600 years ago that the first clock with a face and an hour hand was made. 第一面带有一个钟面和一根时针的钟是在大约600年前制造的。
How long ago is it that you last saw her? 你上一次看见她是多久以前的事?