2. The reason is that part-time teachers usually work in educational institutions or companies outside the school and need to find corresponding positions and opportunities themselves.

3. If you want to be a part-time teacher, you can find job opportunities in the following ways: search for job information in official website, an educational institution or company, find relevant positions through social media or recruitment websites and submit resumes, or get job opportunities through personal recommendation.

It should be noted that part-time teachers need to have certain teaching experience and qualifications, so they need to make full preparations and self-improvement before looking for a job.