Interested in Language
How are you ? I hope you are fine.
Can you tell me please when we use be attentive (adjective) and attention (noun)?
Is it correct if I said be attention? or should I say be attentive.
I am not a teacher.
I think you are asking about the imperative use, what you might say to a class when you want them to be quiet and listen.
"Be attentive." That is perfectly correct English, but it is far too prissy for most purposes.
"Attention!" This is the command that soldiers are given to make them stand still, straight and silent. It would work in the classroom, but you might want to add "students" or "children" or whatever: Attention, students! This "Attention, X" is often heard as a setup for an announcement, often softened to something like, "May I have your attention, please, everyone?"
"Pay attention." The usual stern admonishment.