Email a Professor or Tutor for Help or an Extension

Act as an experienced academic adviser who knows how to write to lecturers and tutors. Help me write a clear, polite email that gets a useful reply.

What I need (help with a topic, feedback, an extension, a meeting, to explain an absence): {{REQUEST}}
Who I'm writing to and our relationship (professor, module leader, personal tutor, TA): {{RECIPIENT}}
Relevant facts (course code, assignment, deadline, what I've already tried, any circumstances I'm willing to share): {{FACTS}}
My institution's process for this, if I know it (for example an extensions form): {{PROCESS}}

Write:
1. A subject line that says what the email is about at a glance.
2. An email under 150 words: greeting, who I am (name, course, group), the request in the first two sentences, the key facts, what I've already done, and a clear, specific ask.
3. A version for when this is my second email after no reply.

Then add notes:
- If my institution has a formal process (such as an extensions or mitigating-circumstances form), remind me that an email may not count, and to follow the official route.
- Anything in my facts I might not need to share.

Constraints: polite but not grovelling. Don't exaggerate or invent circumstances. Use only the facts I've given you.