We useopinionas a noun to mean beliefs or judgements about someone or something. When it refers to the beliefs or judgements of individuals, it is countable:
I’ve never agreed with Chris’sopinionon taxation.
A lot of people have strongopinionsabout bullfighting.(referring to their individual opinions)
When it refers to the beliefs or judgements of a group of people,opinionis usually uncountable:
The government is worried about publicopinion.
We use phrases such asin my opinion,inyour opinion,in Peter’sopinionto show whose opinion we are referring to:
In Maria’s opinion, we paid too much.
We often introduce ideas, especially in writing, with the phrasein my opinion:
In my opinion, there are too many cars on the road with just one person in them.
Not:On my opinion/To my opinion/According to me/In my point of view
We don’t usein my opinionandI thinktogether:
In my opinion, she’s wasting her time.
Not:In my opinion I think she’s wasting her time.
The phrasesIt is my opinion that… andI am of the opinion that… are more formal:
It is my opinion thateveryone should have free healthcare.
I am of the opinion thatthe Prime Minister should resign.
See also:
According to