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IT +IS / HAS BEEN(WAS) + 时间段 +SINCE 从句,It's/has been +一段时间+since从句 自从某时起做某件事情已经一段时间了。,since,been,has,单词记忆法、语法用法、单

知识点1: IT +IS / HAS BEEN(WAS) + 时间段 +SINCE 从句
It +is / has been ( was ) + 时间段 +since 从句
在这一结构中,主句常用一般现在时、现在完成时或一般过去时。如果 since 引导的状语从句中的谓语动词为非延续性动词,则表示“自从状语从句中的动作发生以后,时间过不了多久”。例如:[1]一般现在时,状语从句,相关知识点
as…as引导的状语从句中可以用一般现在时表示将来。[误] I'll call you as long as the book will be returned.[正] I'll call you as long as the book is returned.[析] as…as引导的状语从句中可以用一般现在时表示将来。

1. It is two years since Jim came to China.
吉姆来中国两年了。
2. It has been three years since they got married.[2]since单词记忆法
◆记忆方法一:联想方式:sin四年;ce车自从来广州,他就开了四年车◆记忆方法二:联想方式:sin四年;ce车记忆方法:自从来广州,他就开了四年车

他们结婚已经三年了。
如果 since 从句中的谓语动词为延续性动词,则表示“自从从句谓语动词表示的动作结束以来,时间已过了多久”。例如:[3]谓语动词,动词,相关知识点
谓语动词切忌用“行为动词1 + 原形动词”、“be + 原形动词”。○4have+过去分词。如:Many trees have been cut down since 1970s.(意思同上)○5般时问句和否定句中:do/does/did+原形动词。如:He does not enjoy himself very much.(他日子过的不好。)Did any of you se

3. It is / has been a year since he smoked.
他戒烟已经一年了。
知识点2:It's/has been +一段时间+since从句 自从某时起做某件事情已经一段时间了。

  该句型中since引导的时间状语从句常用一般过去时。例如:
  It's twenty years since he came here. 他来这里已经20年了。
  It has been six years since he married Mary. 他和玛丽结婚已经六年了。考试用书
  如果since从句中的谓语动词是延续性动词,则表示“从该动作结束起一直到现在的时间”。 例如:It's three days since he stayed here. 他离开这儿有三天了。[4]从句,动词,相关知识点
在“动词+宾语+宾补”结构中,如果宾语是不定式、动名词、宾语从句,则常用it做形式宾语,而将实际的宾语移到补语后面去。如:I found the job rather difficult. (我发觉这个工作相当难做。)I found it rather difficult to do the job.

  我搬家到郑州已经20多年了。since I moved to Zhengzhou.

since相关单词意思与记忆法:
since单词意思解释释义:
prep. 自...以后, 自...以来ad. 自那时以后conj. 既然, 自...以后, 自...以来相关词组: long since ever since
since单词记忆法:
◆记忆方法一:
联想方式:sin四年;ce车
自从来广州,他就开了四年车
◆记忆方法二:
联想方式:sin四年;ce车
记忆方法:自从来广州,他就开了四年车
been相关单词意思与记忆法:
been单词意思解释释义:
be的过去分词
has相关单词意思与记忆法:
has单词意思解释释义:
have的第三人称单数现在式相关词组: as Lu Hsun has it...
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。
been单词相关例句:
We should put aside and postpone all other reforms; that we  have but one task-----the istruction of the people, the diffusion of education, the ecourgement of science----on that day a great step will have then been taken in our rgenerion.Leon Gambetta, French educator——我 们应该把一切改革先放下。我们只有 一项任务,就是教育人民,普及知识、倡导科学。这一天到来之时,便是我们振国兴邦之日。法国教育  爱甘必大  L
Politics, as a pracitice, whatever its professions , has always been the systematic organization of hatreds.——Adams Henry, American historian 政治作为一种实践,不管它如何表白,始终是有条不紊的煸动仇恨的组织。美国历史学家 享利.A.
Oh, I am not going to die , am I ? He will not separate us , we have been so happy.——Charlotte Bronta, American writer 哦,我不会死,是吗?它不会使我们分离,我们是多么幸福啊。美国作家 布恩塔 C
No man can be a good ruler unless he has first been ruled. 没受过他人的统治,就不能很好地统治他人。
The paramount duty of Congress is to stop deficiencies by the restoration of that protective legislation which has always been the firmst prop of the Treasury.——William Mckinley, American president 国会的最高职责是恢复始终是国家财政最坚实支柱的保护性立法,以制止财政赤字。美国总统 科金利.W.
But has the last word been said ? Is all hope to be lost ? Is the defeat final No !(Charles De Gaulle , French president )——但是难道败局已定,胜利已经无望?不,不能这样说! (法国总统 戴高乐. C.)
O liberty, how many crimes have been committed in thy name! 自由啊!假你的名义犯了多少罪啊!
Nothing great in the world has been accomplished without passion. (Hegel George Wilhelm)——  这个世界上要是没有热情是不可能完成伟大事业的。(黑格儿 G*W)
The ideals which have lighted my way , and time after time have given me new courage to face life cheerfully 19 have been kindness , beauty and truth .(Albert Einstein , American scientist)  有些理想曾为我们引过道路,并不断给我新的勇气以欣然面对人生,那些理想就是--真、善、美。 (美国科学家 爱因斯坦 . A .)
A politician is a man who undertands government, and it takes a poiltician to run a government. A statesman is a politician who's been dead ten or fifeen years.——H.S.Turman, American president  政客是政府的人,管理政府需要政客,政治家是已死去十至十五年的政客。美国总统 杜鲁门.H.S.  
has单词相关例句:
Politics, as a pracitice, whatever its professions , has always been the systematic organization of hatreds.——Adams Henry, American historian 政治作为一种实践,不管它如何表白,始终是有条不紊的煸动仇恨的组织。美国历史学家 享利.A.
To make your life a sound structrure that will serve others and fulfil your own potential, you have to remember that strength, however massive , can't endure unless it has the interlocking supprt of others. Go it alone and you'll inevitably tumble.——Zichler Edward, Admerican writer 要使你的生活成为有益于他人同时又能发挥你自己的潜力的牢固的建筑,你必须记住,除非与他人的支持联系在一起,否则无论多么大的力量都难以持久,单枪匹马必将一事无成。美国作家 爱德华.Z.
Education has produced  a vast population able to read but unable todistinguish  what is worth  reading.
Of all the possessions of this life fame is the noblest; when the body has sunk into the dust the great name still lives. 人生最可宝贵的是声誉,躯体入土后,声誉犹存。
A poor man who takes a rich wife has a ruler, not a wife. 穷汉娶富妻,必受老婆欺。
How many a pear which presents a blooming face to the would is rotten at  the core, How many an innocent-looking apple, is harbouring a worm in the bud,. But the orange has no secret faults. Its outside is a mirror of its inside. Allen.A.Milne,American writer——表面鲜嫩可爱,内核变坏的梨子在这个世界上不知有多少。看上去纯净无瑕内心早就长了虫的苹果,在这个世界上不知有多少。然而橙子却毫无缺点可以隐瞒,它的外部就是它内心的一面镜子。美国作家  米尔恩.A.A
A curst cow has short horns. 性子烈的牛角短,脾气暴的人为害有限。
He is rich that has few wants. 寡欲者富。
He that has a full purse never wants a friend. 只要袋里有,不愁没朋友。
An upright judge has more regard to justice than to men. 正直的法官重法胜于重人。