написать официальное письмо на английском языке для 6 класса на 120 слов

Sure! Here's a formal letter in English suitable for a 6th-grade student, approximately 120 words:

Dear Principal,

My name is Emily Johnson, and I am a student in 6th grade at Green Valley School. I am writing to kindly ask for your help. Our class is planning a trip to the science museum next month, but we need permission slips from our parents.

We are very excited about this trip because we will learn many new things about science and nature. It will also be a fun way for us to spend time together and explore new ideas. I hope you will approve this trip and support our class.

Thank you very much for your help and understanding. We are looking forward to a wonderful experience.

Sincerely,
Emily Johnson

If you'd like a different tone or more details, let me know!