This structure doesn't work for everything on the attachment. For example,
Question #5 would not be:
"C'est un garçon bel", as that is not simply how one writes it. Instead, the adjective precedes the object, making:
"C'est un bel garçon."
Another example, #7, "C'est un vieux journal."
I don't think it's "C'est un journal vieux...", from what I've learnt.
I don't exactly think there is a definite rule on what types of adjectives go before or after (I think most go after), but personally, I have learnt a some sort of rule from my teacher (by this, I mean that the rule has exceptions) whereby the adjectives that come before the object are encapsulated by this acronym, BANGS, meaning:
Beauty – e.g. beau, belle, moche, etc.
Age – j'ai dix ans (not a c'est + adj + obj structure though)
Number – ils ont deux chiens.
Goodness – bon, bonne, mauvais, mauvaise, etc.
Size – grand, grande, petit, petite, etc.
Hope this helps :D
