How to Say "to comment" in Spanish
The Spanish word for “to comment” is “opinar” — A2 level. This is a very common word in everyday Spanish.

Examples
¿Qué opinas sobre la nueva película?
What do you think about the new movie?
Yo opino que deberíamos salir más temprano.
I think (my opinion is) that we should leave earlier.
Muchos expertos opinan que la economía mejorará pronto.
Many experts believe that the economy will improve soon.
Using 'que' after the verb
Just like in English we say 'I think THAT...', in Spanish you almost always follow 'opinar' with 'que' when you are about to state your thought.
Opinar vs. Pensar
While both mean 'to think,' use 'opinar' specifically when you want to emphasize that it is your personal viewpoint or judgment on a topic.
Using 'de' instead of 'sobre'
Mistake: “¿Qué opinas de el libro?”
Correction: ¿Qué opinas sobre el libro? (While 'de' is sometimes used, 'sobre' is the clearer way to say 'about' a topic).
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