Idleness is the rust of the mind.    懒惰使脑子生锈.
Idleness rusts the mind.    懒惰使人的头脑迟钝.
If a donkey bray at you, don't bray at him.    傻瓜惹著你，你别跟他缠.
If a man deceives me once, shame on him, if he deceives me twice, shame on me.    上当一回头，再多就可耻。
If a man empties his purse into his head, no man can take it away from him.    如果倒空钱袋，装入脑袋，那就无人能够把钱夺走.
If a man will begin with certainties, he shall end in doubts, but if he will be content to begin with doubts, he shall end in certaintics.    如果以肯定开始，必将以怀疑告终；如果愿以怀疑开始，必将以肯定告终.
If at first you don't succeed, try, try again.    初试不成功，努力勿懈怠.
If doctors fail thee, be these three thy doctors; rest, cheerful-ness, and moderate diet.    如果医药不能帮助，那麽注意三件事∶休息，愉快，饮食调和.
If each would sweep before his own door, we should have a clean city (or street).    众擎易举.
If I take care of my character, my reputation will take care of itself.    注意好品行，自有美名声.
If it is not right, do not do it; if it is not true, do not say it.    不正确的事不做，不真实的话不说.
If it were not for hope, the heart would break.    人是靠希望活著的.
If matters not how a man dies, but how he lives.    重要的并不在于一个人怎样死，而是在于他怎样生.
If money be not thy servant, it will be thy master.    不做金钱的主人，就会做金钱的奴隶.
If nobody loves you, be sure it is your own fault.    如果没有人爱你，肯定是你自己有问题.
If one desires to succeed in anything, he must pay the price.    如果想做成点事，就得付出代价一干.
If the beard were all, the goat might preach.    如果有了?需就什麽都行，那麽山羊也可以说教了.
If the blind lead the blind, both shall fall into the ditch.    问道于盲，无益于事.
If the cap fits, wear it.     帽子若适合你，就戴上吧。
If the counsel be good no matter who gave it.    只要忠告中肯，谁提都行.
If the eye do no admire, the heart will not desire.    眼不馋，心不贪.
If the old dog barks, he gives counsel.    如果老狗叫，他是给忠告.
If the pills were pleasant, they would not be gilded.    丸药不苦不会加糖衣.
If the sky fll (or falls), we shall catch larks.    异想天开
If there be neither snow nor rain, then will be dear all sorts of grain.    雨雪不调，五谷价高.
If there were no clouds, we should not enjoy the sun.    吃得苦中苦，方知甜中甜.
If they say you are good, ask yourself if it be ture.    若有人称赞你，要自问对不对.
If things were to be done twice all would be wise.    事事倘能做两次，人人都可称明智.
If thou injurest conscience, it will have its revenge on thee.     伤害良心，将受到良心的严惩。
If two men ride on a horse, one must ride behind.    两人同骑一马，必有一人在后.
If we are bound to forgive an enemy we are not bound to trust him.    如果我们决定宽恕一个敌人，但决不能相信他.
If we cannot get what we like, we have to like what we can get.    随遇而安.
If wise men play the fool, they do it with a vengeance.    智者干傻事，愚蠢到极点.
If wishes were horses, beggars might ride.    愿望不等于事实.
If you agree to carry the calf, they'll make you carry the cow.    得寸进尺.
If you are too fortunate, you will not know yourself; if you are too unfortunate, nobody will know you.    运气太好，得意忘形；运气太坏，无人理会.
If you can be well without health you may be happy without virtue.    如果不健康而能强强壮壮，那麽无美德也可快快乐乐.
If you cannot bite, never show your teeth.    不能打仗，切莫出兵.
If you cannot have the best, make the best of what you have.    如果你不能有最好的，你就充分利用你现有的吧.
If you command wisely, you'll be obeyed cheerfully.    倘君指挥有方，人人欣然听命.
If you confer a benefit, never remember it; if you receive one, remember it always.    施恩勿记，受恩勿忘.
If you dance you must pay the fiddler.    要想寻欢作乐，代价非付不可.
If you don't aim high you will never hit high.    不立大志，难攀高峰.
If you have no hand, you cannot make a fist.    巧妇难为无米之炊.
If you lie upon roses when young, you'll lie upon thorns when old.    年青时躺在玫瑰上，老年时就会躺在荆棘上.
If you live with a lame person, you will learn to limp.    远朱者赤，近墨者黑.
If you make yourself an ass, don't complain if people ride you.    人善被人欺，马善被人骑。
If you remove stone by stone, even a mountain will be levelled.    一块一块把石移，高山也可变平地.
If you run after two hares, you will catch neither.    脚踏两条船，必定落空。
If you run after two heares, you will catch neither.    两头落空.
If you sell the cow, you sell her milk too.    蚀了本也输了利.
If you swear you will catch no fish.    咒骂无益，于事无济.
If you trust before you try, you may repent before you die.    不试就相信，死前要悔恨.
If you venture nothing, you will have nothing.    不入虎穴，焉得虎子。
If you want a pretence to whip a dog, say that he ate the frying-pam.    欲加之罪，何患无辞.
If you want a thing (well) done, do it yourself.    要想做好事情，就要自己动手.
If you want knowledge, you must toil for it.    要想求知，就得吃苦。
If you want knwledge, you must toil for it.    若要求知识，必须刻苦学习.
If you want peace, prepare for war.     欲求和平必先备战。
If you wish for peace, be prepared for war.    想要和平，必须备战.
If you wish good advice, consult an old man.    如要忠告向老人请教.
If you would build for your happiness a sure foundation, let the stone for the corner be a good reputation.    若想为快乐奠立可靠的基础，美好的名声便是奠基的石头.
If you would have a good wife marry one who has been a good daughter.    想得贤妻子，须娶好女儿.
If you would have a thing well done, do it yourself.    如要是情做得好，你须亲自动手搞.
If you would know the value of money, go and try to borrow some, for the that goes a-borrowing goes a-sorrowing.    欲知金钱价，不妨把钱借；借钱味难尝，使人心悲伤.
If you would make an enemy, lend a man money and ask it of him again.    你若想与人成仇结怨，只要借钱给人再催还.
If your ears glow, someone is talking of you.    耳朵发烧，有人念叨。
Ignorance is the mother of impudence.    厚颜无耻由于愚昧无知.
Ignorance is the mother of suspicions.    无知会多疑.
Ignorance of the law excuses no man.    对法律不知不能免罪.
Ill (or Evil) gotten, ill (or evil) spent.    悖入悖出.
Ill air slays sooner thant the sword.    污浊的空气杀人比刀还要快.
Ill news comes space.    恶事传千里.
Ill news flies fast.    恶事传千里.
Ill news never comes too late    坏消息来得快.
Ill news travels fast.    坏事传千里.
Ill-gotten goods never prosper.    发横财，家不发
Ill-gotten wealth never thrives.    悖入悖出.
I'm hard up.    我经济很困难.
I'm really dead.    我真要累死了.
Imagination is more important than knowledge.    想像力比知识更重要.
Imagination is sometimes more vivid than reality.    想像有时比现实生动得多.
Improve your time and your time will improve you.    珍惜时间，时间才会珍惜你.
In a calm sea, every man is a pilot.    平静的海上易驶船.
In a great river great fish are found; but take heed lest you be drowned.    发现大河有大鱼，可得注意别溺毙.
In all things, it is better to hope than to despair.    凡事抱希望为佳，不应悲观而失望.
In an enemy spots are soon seen.    敌人的缺点容易找.
In books, are embalmed the greatest thoughts of all ages.    历代最伟大的思想都载入史册而不朽.
In doing we learn.    行而知.
In every beginning think of the end.    思前顾后.
In every country dogs bite.    天下的狗都要咬人.
In every rank, great or small, 'Tis industry supports us all.    不论高的低的各级人士，所持的都是勤劳.
In for a penny, in for a pound    一不做，二不休.