英语作文补课的讲解可以从以下几个方面进行：

引言

可以通过描述自己的感受或经历来引出补课的话题，例如：“Summervacation came. I thought I could have a rest after this semester's hard work. So I had to get up early every morning and walk a long way to the teacher's.”

补课的原因

解释为什么需要补课，例如：“It is nothing new that many students go to take after-school classes now.” 或者 “Parents, especially those teenagers, care about children's education more than anything else. They would do everything for their children, including spending most of their spare time coaching studies.”

补课的过程

描述补课的具体过程，例如：“Then, English class began. The teacher came, and said, 'Who wants to go to the bathroom？' I said, 'I do!' Then I ran out of the classroom. The teacher said, 'Today we have an exam!' I was surprised. The teacher took photos and distributed the test papers. There was only one sheet, and I did all the questions correctly. Then we moved on to reciting texts. We took out the books and flipped to page 20, which I had already finished. Then we flipped to page 21, one of which was taught by the teacher, and page 22, two of which were helped by classmates. The teacher marked a tick and said, 'Keep it up!'"

补课的感受

表达自己在补课过程中的感受，例如：“What a hard time for me! But I knew I had to put in the effort to improve my English.”

结尾

总结补课的意义，例如：“Although the process was tough, I felt that it was worth it in the end.” 或者 “After the class, I realized that I needed to work harder and manage my time better to succeed in my studies.”

通过以上几个方面的讲解，可以帮助学生更好地理解和表达补课的相关内容。同时，建议在写作过程中注意语言的准确性和流畅性，尽量使用生动形象的例子和表达，使作文更具吸引力。