Question

Son___ cuadernos

Answer 1

They are ___ notebooks

Answer 2

you can put any adjective, just tell me one in english and i can translate into spanish for you

Answer 3

Actually, I think you have to put a number. For example...

"Son dos cuadernos" (Those are two notebooks)
"Son cinco cuadernos" (Those are five notebooks)

If you would put some other adjectiv such as color or size, then the sentence would look like this:

"Los cuadernos son rojos" (The notebooks are red)
"Los cuadernos son grandes" (The notebooks are big)

Answer 4

Also, it doesn't really have to be an adjective. You could show possession. Like saying "They are his notebooks." or "They are their notebooks."

It would be "Son sus cuadrernos"