I am caught between the devil and the deep blue sea. 进退维谷。
I am not now that which I have been. 今日之我已非昔日之我。
I am not what I used to be . 今日之我已非昔日之我。
I believe the first test of truly great man is his humility. 一个真正伟大的人，对他的第一个考验就是看他是否谦逊。
I hate to see things done by halves.---If it be right, do it boldly, ---if it be wrong, leave it undone. 事情不要做一半；对的，就做下去，不对，就丢开。
I have brought an ill comb to my own head. 蚕丝作茧，自缚其身。
I know no such thing as genius; it is nothing but labour and diligence.世上无天才，勤学加苦练。
I know the difference between chalk and cheese. 是贵是贱，我能分辨。
I regard that man as lost,, who has lost his sense of shame. 我认为，人丧失了廉耻就完了。
I taught you to swim, and now you'd drown me. 恩将仇报。
Ice and live charcoal cannot be placed in the same furnace; the enemy and ourselves do not go the same way. 冰炭不同炉，敌我不同路。
Ideals are like the stars -- we never reach them, but like mariners, we chart our course by them.理想好像星星，不能摘到，但我们犹如水手，可借它指引航向。
Idle people folks have the most labour(take the most pains).懒人做工作，越懒越费劲。
Idleness is the key of beggary, and the root of all evil. 懒惰是行乞的敲门砖，是万恶的根源。
It is the nature of folly to see the faults of others and forget his own. 愚蠢的本质是只看到别人的错处而忘却了自己的过失。
It is the eculiarity of knowledge that those who really thirst for it always get it. 知识的特点就在于真正渴求知识的人总能得到它。
It is too late to come with the water when the house is burnt down.马后炮。
It never rains but it pours. 不雨则已，一雨倾盆。
It takes all sorts to make a world.大千世界，千奇百怪。
It is no use pumping a dry well. 涸井汲水，徒劳无益。
It is not a sign of humility to declaim against pride. 叱责傲慢并非是谦逊的标志。
It is not every couple that is a pair. 天下夫妻多，珠联璧合少。
It is not helps, but obstacles, not facilities but difficulties, that make men. 造就人的，不是帮助，而是磨难，不是方便，而是困难。
It is not what is she, but what has she. 不问她是什么样的，要看她有什么样的。
It is not work that kills, but worry. 工作不会伤身，伤身乃是忧虑。
It is one thing to speak much and another to speak pertinently.话说得多是一回事，说得中肯是另一回事。
It is said that a cat hath nine lives, yet care would wear them all out. 据说猫有九条命，忧虑过多也伤身。
It is hard halting before a cripple. 跛子面前难装跛。/孔子门前难卖文。
It is hard to make an old mare leaving flinging. 恶习难改。
It is hard to sit in Rome and strive against the Pope. 胳膊扭不过大腿。
It is harder to change human nature than to change rivers and mountains. 江山易改，本性难移。
It is harder to marry a daughter well than to bring her up well. 养女容易嫁女难。
It is hidden wrath that harms. 闷气伤人。
It is ill jesting with edged tools. 有刃之物不宜耍弄，神威权势不可怠慢。
It is impossible that a man who is false to his friends should be true to his country. 对朋友不义，不可能对国家效忠。
It is in vain to cast your net where there is no fish. 在无鱼的地方撒网，白忙一场。
It is lost labour to sow where there is no soil. 没有土壤，播种也是徒劳。
It is love that makes the world go round. 爱情使世界转动。
It is an equal failing to trust everybody and trust nobody. 信任任何人和不信任任何人，同样是缺点。
It is an evil sigh to see a fox lick a lamb. 狐狸舔羊羔，不是好迹象。
It is as natural to die as to be born. 有生必有死。
It is best to compare truth to a flint-- the harder it is struck, the more brilliantly its sparks shine.最好是把真理比作燧石，它受到的敲打越厉害，发射出的光辉就越灿烂。
It is better for the doer to undo what he has done. 解铃还需系铃人。
It is better to be a beggar than a fool. 宁为乞丐，不做傻瓜。
It is better to be a has-been than a never-been. 宁可昙花一现，也不总是默默无闻。
It is better to be a martyr than a confessor. 与其作忏悔者，不如做殉道者。
It is better to reign in hell than serve in heaven.宁在地狱称王，不在天堂为臣。
It is better to trust the eye…
It is good horse that never stumbles. 好马也有失蹄时。
It is a good tongue that says no ill, and a better heart that thinks none.再干净的嘴也会吐恶言，再善良的心也会想坏事。
It is a good workman that never blunders. 智者千虑，必有一失。
It is a great art to laugh at your own misfortune.对己之不幸付之一笑，这是一门伟大的艺术。
It is a sad house where the hen crows louder than the cock. 母鸡司晨家不兴。
It is a silly fish that is caught twice with the same bait. 聪明人不上两回当。
It is a small flock that has not a black sheep. 处处有败类。
It is a wise child that knows its own father. 再聪明的孩子也不见得都知道自己的父亲。