Type 1 引述他人观点(为提出自己的观点铺垫)
1. It is widely (commonly)accepted (hold)+that...
2. A widely accepted(commonly) hold idea (point of view, viewpoint, opinion, assumption)is that...
3. It is taken for granted +THAT(or: We often/ frequently take it for granted that...)
Type 2 提出异议
1. In fact (As a matter of fact),...
3. However, it is not (quite,necessarily) the case.
3. This (It) is not (quite,necessarily) the case and needs to be further considered/discussed. (or: further consideration/discussion)
Type 3 论述的展开:说明原因和理由,层进,举例,转折
1. The reason lies in several aspects,...
2. The reason why +clause+...
3. There are several remarkable reasons.