1. 'believe me, . . . ' ; 'take it from me, . . . ' ; 'I'm sure that . . '
2. 'that's not right' ; 'you're wrong/mistaken' ; 'I don't agree'
3. 'I think that . . [alternative formulation or proposition]' ; 'it's not quite like that . . ' ; 'You could perhaps say . . '
4. 'I don't agree/I disagree with you/I think you're wrong; I think that . . [opposite/alternative]'
5. 'I would have thought that . . ' ; 'I would think that . . '
6. 'That's right/correct' ; 'You're right' ; 'I agree with that'