Word/Phrase: opinan
Translation: they think
Pronunciation: o.piˈnan
They think it's a good idea - Ellos opinan que es una buena idea
I think you should ask them - Yo opino que deberías preguntarles
What do you think about this? - ¿Qué opinas sobre esto?
Many people think differently - Muchas personas opinan de manera diferente
In my opinion, it's the best choice - En mi opinión, es la mejor opción