[chryuop]

Kono inu wa chiisai desu.
kono remon wa ii desu.
Where is the difference?

I guess you have a little confusion there about what is the predicative use of the adjectives and the normal adjective. I will try with an example:

the car is red ==> kuruma ha akai (desu).
the red car ==> akai kuruma.

Same way for na adjectives, since in the other thread you used the example of the flower I keep working with it...maybe it helps you.

the flower is pretty ==> hana ha kirei desu.
the pretty flower ==> kireina hana.

Just a suggestion...learn firs the writing, even before starting with grammar...it helps alot.