Dear headmaster,
I hear that you're asking for advice(征求意见) on what colour to paint in your school. Here's my thought.
I think yellow is suitable for(对……合适) classrooms since yellow stands for(代表) wisdom and success. It will encourage students to listen carefully(促使学生认真听讲) and work hard. When reading, students need a quiet and comfortable space to enjoy themselves. I think blue is a good choice(一个好的选择) for reading rooms. It makes them feel calm. While(然而) for the playrooms, I suggest green. Green makes students feel energetic(感到精力充沛). It will help students exercise more. At last, I think you can paint the outer walls(外墙) of the school white and draw some colourful pictures on them. And that will remind the students of the lively school life(生动有趣的校园生活).
That's all for my advice. I hope you will find it useful(认为它有用,句式find it + 形容词,发现某物……).
本文第一段是总领句;
第二段针对于校园的各个区域给出了自己的涂刷意见及其原因;
第三段写了自己的希望,希望自己的建议可以被采纳。
本文内容完整、充实,用词地道、句式多变,且文章有层次。文章的建议都有理有据,很有说服力。