评论型作文也称开放型议论文，因为文章只是客观地分析和评论某一事物的正反两方面，或在某一问题上反映出来的两种不同看法，并不下结论说这个事物对或错，这个看法正确与否。
句型结构：
P1: S1 Topic: the issue to be commented
S2 Thesis: different attitudes towards it
P2: S3 Its advantages or one’s side’s opinion
S4 Detail 1
S5 Detail 2
S6 Transition
S7 Its disadvantages or the other side’s opinion
S8 Detail 1
S9 Detail 2
P3: S10 The balanced view
Sentence Pattern
S1: Why should we…? Does …? Such question as these are often asked, especially by those…
S2: The answers to these questions vary from
Opinion of the issue often differ sharply/ widely.
Attitude towards the problem
S3: Some people argue/maintain that …
As is often/frequently pointed out
S4: There is no doubt that…
denying
S5: It certainly helps people to solve /enjoy/ benefit…
offers greater opportunity/chance to