Agreements and disagreements are usually about your personal thoughts and feelings about something. Phrases like “I think” or “in my opinion” make it clear that you are giving an opinion and not a fact. This phrase is used if you partially agree with certain points, but maybe you don`t entirely agree. These words express a strong correspondence with another person. This is a firmer, but more formal way of expressing your disagreement. These lines from Katy Perry`s song, “Agree to Disagree,” show that just because you don`t agree with someone doesn`t mean a friendly, romantic, or even professional relationship isn`t possible. In fact, agreements and disagreements are part of any relationship. This is another way of saying that you completely agree with someone.