"How to express the concept of 'opinion' in English?"
The term "opinion" in English can be expressed in a number of ways depending on the context. It can be used as a noun, verb or adjective. As a noun, it refers to a personal view or belief about something. For example, "What is your opinion on the new policy?" Here, "opinion" is being used to ask for someone's thoughts or perspective on a particular issue.
As a verb, "to opinionate" means to express one's opinions openly and forcefully. For instance, "He often opinionsated during heated debates." In this sentence, "opinionsated" is used to describe someone who expresses their views aggressively.
When used as an adjective, "opinionated" describes someone who strongly believes in their own opinions and isn't afraid to share them. For example, "She is a very opinionated person and isn't afraid to speak her mind."
In short, "opinion" in English can refer to a personal view or belief, express open and forceful expression of views, or describe someone who strongly believes in their own opinions.