Please write two e-mails: one formal e-mail using formal language and tone and one informal e-mail using informal language and tone. Your topic can be one of the following:
1. A complaint to your landlord about a problem in your apartment
2. Planning a business meeting or a team meeting with you classmates
3. Asking for clarification from a professor or student
4. Sharing weekend plans or upcoming plans for Thanksgiving break
5. Returning a defective product you purchased and asking for refund.