Wash your hands well with soap and warm water for at least 20 seconds.
Cook pasta in a large pot following package instructions, drain and rinse with cold water to stop cooking. Add cooked pasta to a large mixing bowl.
Wash and cut green onions into small pieces, discard white root ends.
Wash and cut celery into small pieces, discard white root ends.
Cut cheese into small pieces.
Drain tuna and rinse and drain sweet peas. Combine all ingredients and stir until ingredients are mixed well. Cover and chill in the refrigerator for at least an hour.