1. They pledged not to break relations with the country.

2. She ' s just broken up with her boyfriend.

3. It is an indication of his mentality and yearning through the so - called" diffidation "with his close friend.

4. Cut off a friendship.

5. I decided to cut off contact with John because he was always negative.

6. Cut off ties with someone.

这些句子涵盖了不同的表达方式和语境，可以根据具体需求选择合适的句子。