To establish a friendly communication level with your teacher, it is important to show respect, be attentive, and actively participate in class discussions. You can also ask questions, seek clarification when needed, and show interest in the subject matter. Building a rapport with your teacher by being polite, approachable, and showing genuine interest in their feedback can help create a friendly and positive communication dynamic. Remember to be open to feedback and willing to engage in constructive conversations to foster a friendly relationship with your teacher. **

When one is not friendly towards the communication partner, a more formal and professional closing formula can be chosen. For example, "Sincerely," or "Best regards," are appropriate options that maintain a level of politeness without being overly warm or friendly. These closing formulas help to maintain a sense of professionalism and respect in the communication, even if the relationship between the parties is not particularly friendly. **

When one is not friendly towards the communication partner, a more formal and professional closing formula can be chosen. For example, "Thank you for your time and attention to this matter" or "I appreciate your cooperation in this regard" can be used to maintain a respectful tone while keeping a distance. It is important to remain polite and professional in all communication, even when the relationship with the partner is not friendly. **