Let’ s define the concepts of "fact and opinion"
Fact – A fact generally refers to something that is true and can be verified as such. That is, a fact is something that can be proven to be true.
Opinion – An opinion refers to a personal belief. It related to how someone feels about something. Others may agree or disagree with an opinion, but they cannot prove or disprove it. This is what defines it as opinion.
Let’s now take a look at some examples of those signal words and phrases being used in the sentence fragments that often precede a statement of fact or opinion:
Fact
· The annual report confirms …….
· Scientists have recently discovered …….
· According to the results of the rests ……
· The investigation demonstrated ……
Opinion
· He claimed that ………….
· It is the officer’s view that ……….
· The report argues that ………….
· Many scientists suspect that …………
As we can see from the above examples, the language used to introduce a statement can be helpful in indicating whether it is being framed as a fact or an opinion.
It is important for students to understand too that things are not always as they appear to be. At times, writers, whether consciously or not, will frame opinions as fact and vice versa. This is why it is important that students develop a clear understanding of what constitutes fact and opinion and are offered ample opportunities to practice distinguishing between the two.
Source: http://www.literacyideas.com/teaching-fact-and-opinion
Word list on opinion and statements
Stating your opinion
· It seems to me that …
· In my opinion, …
· I am of the opinion that …/ I take the view that ..
· My personal view is that …
· In my experience …
· As far as I understand / can see, …
· As I see it, … / From my point of view …
· As far as I know … / From what I know …
· I might be wrong but …
· If I am not mistaken …
· I believe one can (safely) say
· It is claimed that …
· I must admit that …
· I cannot deny that …
· I can imagine that …
· I think/believe/suppose …
· Personally, I think …
· That is why I think …
· I am sure/certain/convinced that …
· I am not sure/certain, but …
· I am not sure, because I don't know the situation exactly.
· I am not convinced that …
· I have read that …
· I am of mixed opinions (about / on) …
· I am of mixed opinions about / on this.
· I have no opinion in this matter.
Outlining facts
The fact is that
The (main) point is that …
This proves that …
What it comes down to is that …
It is obvious that …
It is certain that …
One can say that …
It is clear that …
There is no doubt that …
Source: https://www.ego4u.com/en/business-english/communication/opinion