Idleness is the rust of the mind.    懶惰使腦子生銹.
Idleness rusts the mind.    懶惰使人的頭腦遲鈍.
If a donkey bray at you, don't bray at him.    傻瓜惹著你，你別跟他纏.
If a man deceives me once, shame on him, if he deceives me twice, shame on me.    上當一回頭，再多就可恥。
If a man empties his purse into his head, no man can take it away from him.    如果倒空錢袋，裝入腦袋，那就無人能夠把錢奪走.
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.    如果以肯定開始，必將以懷疑告終；如果愿以懷疑開始，必將以肯定告終.
If at first you don't succeed, try, try again.    初試不成功，努力勿懈怠.
If doctors fail thee, be these three thy doctors; rest, cheerful-ness, and moderate diet.    如果醫藥不能幫助，那麼注意三件事∶休息，愉快，飲食調和.
If each would sweep before his own door, we should have a clean city (or street).    眾擎易舉.
If I take care of my character, my reputation will take care of itself.    注意好品行，自有美名聲.
If it is not right, do not do it; if it is not true, do not say it.    不正確的事不做，不真實的話不說.
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.    重要的并不在于一個人怎樣死，而是在于他怎樣生.
If money be not thy servant, it will be thy master.    不做金錢的主人，就會做金錢的奴隸.
If nobody loves you, be sure it is your own fault.    如果沒有人愛你，肯定是你自己有問題.
If one desires to succeed in anything, he must pay the price.    如果想做成點事，就得付出代價一干.
If the beard were all, the goat might preach.    如果有了?需就什麼都行，那麼山羊也可以說教了.
If the blind lead the blind, both shall fall into the ditch.    問道于盲，無益于事.
If the cap fits, wear it.     帽子若適合你，就戴上吧。
If the counsel be good no matter who gave it.    只要忠告中肯，誰提都行.
If the eye do no admire, the heart will not desire.    眼不饞，心不貪.
If the old dog barks, he gives counsel.    如果老狗叫，他是給忠告.
If the pills were pleasant, they would not be gilded.    丸藥不苦不會加糖衣.
If the sky fll (or falls), we shall catch larks.    異想天開
If there be neither snow nor rain, then will be dear all sorts of grain.    雨雪不調，五谷價高.
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.    若有人稱贊你，要自問對不對.
If things were to be done twice all would be wise.    事事倘能做兩次，人人都可稱明智.
If thou injurest conscience, it will have its revenge on thee.     傷害良心，將受到良心的嚴懲。
If two men ride on a horse, one must ride behind.    兩人同騎一馬，必有一人在后.
If we are bound to forgive an enemy we are not bound to trust him.    如果我們決定寬恕一個敵人，但決不能相信他.
If we cannot get what we like, we have to like what we can get.    隨遇而安.
If wise men play the fool, they do it with a vengeance.    智者干傻事，愚蠢到極點.
If wishes were horses, beggars might ride.    愿望不等于事實.
If you agree to carry the calf, they'll make you carry the cow.    得寸進尺.
If you are too fortunate, you will not know yourself; if you are too unfortunate, nobody will know you.    運氣太好，得意忘形；運氣太壞，無人理會.
If you can be well without health you may be happy without virtue.    如果不健康而能強強壯壯，那麼無美德也可快快樂樂.
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，你就充分利用你現有的吧.
If you command wisely, you'll be obeyed cheerfully.    倘君指揮有方，人人欣然聽命.
If you confer a benefit, never remember it; if you receive one, remember it always.    施恩勿記，受恩勿忘.
If you dance you must pay the fiddler.    要想尋歡作樂，代價非付不可.
If you don't aim high you will never hit high.    不立大志，難攀高峰.
If you have no hand, you cannot make a fist.    巧婦難為無米之炊.
If you lie upon roses when young, you'll lie upon thorns when old.    年青時躺在玫瑰上，老年時就會躺在荊棘上.
If you live with a lame person, you will learn to limp.    遠朱者赤，近墨者黑.
If you make yourself an ass, don't complain if people ride you.    人善被人欺，馬善被人騎。
If you remove stone by stone, even a mountain will be levelled.    一塊一塊把石移，高山也可變平地.
If you run after two hares, you will catch neither.    腳踏兩條船，必定落空。
If you run after two heares, you will catch neither.    兩頭落空.
If you sell the cow, you sell her milk too.    蝕了本也輸了利.
If you swear you will catch no fish.    咒罵無益，于事無濟.
If you trust before you try, you may repent before you die.    不試就相信，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，何患無辭.
If you want a thing (well) done, do it yourself.    要想做好事情，就要自己動手.
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.    若要求知識，必須刻苦學習.
If you want peace, prepare for war.     欲求和平必先備戰。
If you wish for peace, be prepared for war.    想要和平，必須備戰.
If you wish good advice, consult an old man.    如要忠告向老人請教.
If you would build for your happiness a sure foundation, let the stone for the corner be a good reputation.    若想為快樂奠立可靠的基礎，美好的名聲便是奠基的石頭.
If you would have a good wife marry one who has been a good daughter.    想得賢妻子，須娶好女兒.
If you would have a thing well done, do it yourself.    如要是情做得好，你須親自動手搞.
If you would know the value of money, go and try to borrow some, for the that goes a-borrowing goes a-sorrowing.    欲知金錢價，不妨把錢借；借錢味難嘗，使人心悲傷.
If you would make an enemy, lend a man money and ask it of him again.    你若想與人成仇結怨，只要借錢給人再催還.
If your ears glow, someone is talking of you.    耳朵發燒，有人念叨。
Ignorance is the mother of impudence.    厚顏無恥由于愚昧無知.
Ignorance is the mother of suspicions.    無知會多疑.
Ignorance of the law excuses no man.    對法律不知不能免罪.
Ill (or Evil) gotten, ill (or evil) spent.    悖入悖出.
Ill air slays sooner thant the sword.    污濁的空氣殺人比刀還要快.
Ill news comes space.    惡事傳千里.
Ill news flies fast.    惡事傳千里.
Ill news never comes too late    壞消息來得快.
Ill news travels fast.    壞事傳千里.
Ill-gotten goods never prosper.    發橫財，家不發
Ill-gotten wealth never thrives.    悖入悖出.
I'm hard up.    我經濟很困難.
I'm really dead.    我真要累死了.
Imagination is more important than knowledge.    想像力比知識更重要.
Imagination is sometimes more vivid than reality.    想像有時比現實生動得多.
Improve your time and your time will improve you.    珍惜時間，時間才會珍惜你.
In a calm sea, every man is a pilot.    平靜的海上易駛船.
In a great river great fish are found; but take heed lest you be drowned.    發現大河有大魚，可得注意別溺斃.
In all things, it is better to hope than to despair.    凡事抱希望為佳，不應悲觀而失望.
In an enemy spots are soon seen.    敵人的缺點容易找.
In books, are embalmed the greatest thoughts of all ages.    歷代最偉大的思想都載入史冊而不朽.
In doing we learn.    行而知.
In every beginning think of the end.    思前顧后.
In every country dogs bite.    天下的狗都要咬人.
In every rank, great or small, 'Tis industry supports us all.    不論高的低的各級人士，所持的都是勤勞.
In for a penny, in for a pound    一不做，二不休.