People say that..., but I think...
1. Some people say that music has gone downhill since Beethoven, but I don't really agree.
2. People say that boys usually do better work than girls on exams, but I think it is not necessarily the case.
3. Some people say that older persons are no use for the world, but I entirely disagree with them.
A: People say that you never have a real winter in the South China, but I don't think so.
A: I did experience a winter with snow in Kunming, the Spring City.
B: With snow in Kunming? That's crazy!