忠言逆耳

　　Advice most needed is least heeded.

　　大军出动，粮草先行

　　An army marches on its stomach.

　　如无近虑，必有后忧

　　Better be safe than sorry.

　　死有重于泰山，有轻于鸿毛

　　Beter to die with honor than live with shame.

　　良药苦口

　　Bitter pills may have blessed effects.

　　人要衣装

　　Clothes make the man.

　　多作孽必自毙

　　Crime does not pay.

　　人非圣贤

　　Every man has his faults.

　　愚公移山

　　Faith will move mountains.

　　事有先后

　　First things first.

　　得寸进尺

　　Give him an inch and he'll want a yard.

　　内在美胜于外在美

　　Goodness is better than beauty.

　　坐失良机

　　He who hesitates is lost.

　　金钱非万能

　　Money isn't everything.

　　没有不劳而获

　　No pain, no gain.

　　见风转舵

　　See which way the wind is blowing.

　　聊胜于无

　　Something is better than nothing.

　　眼睛是灵魂之窗

　　The eyes are window of the soul.

　　以上就这些在汉语中常用的成语在雅思写作中的表达方式，大家可以根据自己的雅思写作话题的不同来选择适当的成语进行应用。但是一定要记得要和上下文结合到一起。