1、A bad beginning makes a bad ending.
不善始者不善终。
2、A bad thing never dies.
遗臭万年。
3、A bad workman always blames his tools.
不会撑船怪河弯。
4、A bird in the hand is worth than two in the bush.
一鸟在手胜过双鸟在林。
5、A boaster and a liar are cousins-german.
吹牛与说谎本是同宗。
6、A bully is always a coward.
色厉内荏。
7、A burden of one's choice is not felt.
爱挑的担子不嫌重。
8、A candle lights others and consumes itself.
蜡烛照亮别人，却毁灭了自己。
补充：
1、I cannot be your friend and your flatterer too.
朋友不能阿谀奉承。
2、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。
3、If you make yourself an ass, don't complain if people ride you.
人善被人欺，马善被人骑。
4、If your ears glow, someone is talking of you.
耳朵发烧，有人念叨。
5、If you run after two hares, you will catch neither.
脚踏两条船，必定落空。
6、If you sell the cow, you sell her milk too.
杀鸡取卵。
7、If you venture nothing, you will have nothing.
不入虎穴，焉得虎子。
8、If you want knowledge, you must toil for it.
要想求知，就得吃苦。
9、Industry is the parent of success.
勤奋是成功之母。
10、It is better to die when life is a disgrace.
宁为玉碎，不为瓦全。
11、It is easier to get money than to keep it.
挣钱容易攒钱难。
12、It is easy to be wise after the event.
事后诸葛亮好当。
13、It is easy to open a shop but hard to keep it always open.
创业容易守业难。
14、It is hard to please all.
众口难调。
15、It is never too old to learn.
活到老，学到老。
16、It is no use crying over spilt milk.
覆水难收。
17、It is the first step that costs troublesome.
万事开头难。
18、It is the unforeseen that always happens.
天有不测风云，人有旦夕祸福。
19、It is too late to grieve when the chance is past.
坐失良机，后悔已迟。
20、It never rains but it pours.
不鸣则已，一鸣惊人。