1.If the old dog barks, he gives counsel.

　　老狗叫,是忠告。

　　2.If the mountain wont come to Mohammed,Mohammed must go to the mountain.

　　大山不能向穆罕默德走来，穆罕默德只得向大山走去。

　　3.If the sky falls we shall catch larks.

　　天塌下来我们正好可以抓云雀。

　　4.if you give himan inch，he willtake a mile．

　　得寸进尺。

　　5.If you want knowledge,you must toil for it.

　　要想求知,就得吃苦.

　　6.If you dont aim high you will never hit high.

　　不立大志,难攀高峰.

　　7.If your ears glow,someone is talking of you.

　　耳朵发烧,有人念叨.

　　8.If you want to watch more,please go upstair.

　　欲穷千里目,更上一层楼.

　　9.If you venture nothing,you will have nothing.

　　不入虎穴,焉得虎子

　　10.If you run after two hares,you will catch neither.

　　脚踏两条船,必定落空

　　11.If you make yourself an ass,dont complain if people ride you.

　　人善被人欺,马善被人骑

　　12.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.

　　13.If you sell the cow,you sell her milk too.

　　杀鸡取卵.

　　14.If you want knowledge,you must toil for it.

　　要想求知,就得吃苦

　　15.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.

　　16.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.

　　17.If at first you dont succeed, try, try again.

　　初试不成功,努力勿懈怠.

　　18.If doctors fail thee, be these three thy doctors; rest, cheerful-ness, and moderate diet.

　　如果医药不能帮助,那么注意三件事∶休息,愉快,饮食调和.