This may not be related to this lesson but how do you know when to add 'de' in between the adjective and the noun? For example:
No leiste ningún libro de italiano. (Here there is a 'de' in between 'libro'and 'italiano'.)
La florista no vende ninguna flor amarilla. (Here 'flor'and 'amarilla' are together)
How do you know when to add a 'de'?
Thanks.