考研英语中常用的谚语包括：
1. Practice makes perfect. 熟能生巧。
2. God helps those who help themselves. 天助自助者。
3. Easier said than done. 说起来容易做起来难。
4. Where there is a will, there is a way. 有志者事竟成。
5. One false step will lead to disaster. 一失足成千古恨。
6. A bad beginning makes a bad ending. 不善始者不善终。
7. A bird in the hand is worth two in the bush. 一鸟在手胜过双鸟在林。
8. A close mouth catches no flies. 紧闭的嘴巴抓不到苍蝇。
9. Every cloud has a silver lining. 黑暗中总有一线光明。
10. Early to bed and early to rise, makes a man healthy, wealthy and wise. 早睡早起，使人健康、富有而聪明。
11. Don't put off till tomorrow what should be done today. 今日事，今日毕。
12. Every man is the architect of his own fortune. 每个人都是自己命运的建筑师。
13. The greatest hate springs from the greatest love. 最大的恨来自最大的爱。
14. Love makes all hard hearts gentle. 爱情把一切冷酷之心变成温柔。
15. The course of true love never did run smooth. 真爱的道路绝不平坦。
16. The harder you work, the luckier you get. 越努力，越幸运。
17. The only constant in life is change. 生活中唯一不变的是变化。
18. Time is money. 时间就是金钱。
19. Where there is a will, there is a way. 有志者事竟成。
20. Without respect, love cannot go far. 没有尊重的爱难以久存。
这些谚语可以帮助你丰富考研英语作文的内容，展示你的英语语言能力以及对英语文化的理解。