before单词相关例句：
Don't count your chicken before they are hatched. 不要过早乐观。
Don't count your chickens before they are hatched. 蛋未孵，别先数鸡。
Cast not your pearls before swine. 明珠莫投暗。
Rain before seven; fine before eleven. 雨过天晴。
Laugh before breakfast you'll cry before supper. 乐极生悲。
Laugh before breakfast and you'll cry before supper. 笑得早也会哭得早。
One hour's sleep before midnight is worth three after. 午夜前睡一小时抵得上午夜后睡三小时。
The golden age is before us, not behind us. 黄金时代是在我们前面而不在我们背后.
Learn to walk before you run. 循序渐进。
If each would sweep before his own door, we should have a clean city (or street). 众擎易举。
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。
when单词相关例句：
If you don't learn to think when you are young , you may never learn .(Thomas Edison , American inventor )——如果你年轻时就没有学会思考，那么就永远学不会思考。(美国发明家 爱迪生 . T.)
We can not tell the precise moment when friendship is founded, As in filling a vessel drop by drop, there is at last a drop which makes it run over ; so in a serics of kindness there is at last one which makes the heart run over.——James Boswell, British writer 我们无法讲出友谊缔造的确切时刻，就像一点一滴地倾注一个容器一样，终有一滴使容器满溢；因此，面对接二连三的好意，终有那么一次会动人心弦，情谊洋溢。英国作家 博斯韦尔,J.
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。
The best fish smell when they are three days old. 鱼过三天后，再鲜也变臭。
Marry your son when you will, your daughter when you . 给儿子娶亲，想在什么时候皆可；把女儿嫁人要在有力量时才行。
A man never discloses his own character so clearly as when he describes another's. 一个人在描述别人的性格时最能暴露出自己的性格。
A  man who does not know what passion is will never know   love because love can come into being only when there is total self aban -donment .一个不懂得徼情的人永远不会懂得爱，因为只有在完全无我的时候，才有达到爱的境界。印度出生的宗教哲学家    克里希纳穆尔.J.
It is too late to lock the stable door when the steed is stolen. 贼出关门。
The devil is good when he is pleased. 魔鬼高兴，也发善心。
All are brave when the enemy flies. 敌人逃跑时，个个都勇敢。