以下是一篇关于考试失败的八年级英语作文写作指导：

How to Write an English Composition about Failing in an Exam for Grade 8

When writing an English composition about failing in an exam, you can follow these steps: 1. Introduction Start by briefly introducing the topic and expressing your feelings about the failure. For example, \I felt really down when I knew I failed the exam.\ 2. Describe the exam Explain what the exam was about, how difficult it was, and what you expected before the exam. 3. Analyze the reasons for failure This is an important part. You could mention not studying hard enough, not understanding some key points, being too nervous during the exam, or not managing your time well. 4. Learn from the failure Talk about what you have learned from this experience. Maybe you will make a better study plan, seek help from teachers or classmates, or practice more to improve your skills. 5. Conclusion Sum up your thoughts and express your determination to do better next time. For instance, \Although I failed this time, I am determined to work harder and do better in the future.\ Remember to use simple and clear language, and try to avoid grammar mistakes. Also, you can use some connecting words and phrases like \firstly\ \secondly\ \however\ \therefore\ to make your composition more logical.