SOME TIPS AS TO HOW TO AGREE & DISAGREE WITH AN OPINION:
  
 A. How to Agree Strongly with an Opinion. 
1. I couldn't agree more! 
2. That's absolutely true! 
3. Absolutely! 
4. I agree with your point. 
5. I'd go along with you there. 
6. I'm with you on that. 
7. That's just what I was thinking. 
8. That's exactly what I think. 
9. That's a good point. 
10. That's just how I see it. 
11. That's exactly my opinion. 
  
 B. How to Half Agree with an Opinion. 
1. Yes, perhaps, however ... 
2. Well, yes, but ... 
3. Yes, in a way, however ... 
4. Hmm, possibly, but ... 
5. Yes, I agree up to a point, however ... 
6. Well, you have a point there, but ... 
7. There's something there, I suppose, however. 
8. I guess you could be right, but ... 
9. Yes, I suppose so, however ... 
10. That's worth thinking about, but ... 
  
 C. How to Disagree Politely with an Opinion. 
1. I am not so sure. 
2. Do you think so? 
3. Well, it depends. 
4. I'm not so certain. 
5. Well, I don't know. 
6. Well, I'm not so sure about that. 
7. Hmm, I'm not sure you're right. 
8. I'm inclined to disagree with that. 
9. No, I don't think so. 
  
 D. How to Disagree Strongly with an Opinion. 
1. I disagree. 
2. I disagree with your idea. 
3. I'm afraid I don't agree. 
4. I'm afraid your idea is wrong. 
5. I can't agree with you. 
6. I couldn't accept that for a minute. 
7. You can't actually mean that. 
8. I wouldn't go along with you there. 
9. You can't be serious about that. 
10. You must be joking. 
11. It's possible you are mistaken about that. 
  
 Note -  You need to be very polite when disagreeing with someone... even someone you know quite well.  With someone you know very well, you can disagree more directly.