Quell'albero, il cui tronco è molto grande, è nel giardino botanico.

Questions & Answers about Quell'albero, il cui tronco è molto grande, è nel giardino botanico.

Why does "whose trunk" translate to il cui tronco? Do we always need the article il?
Yes, to say "whose" in Italian, you must use a definite article + cui. You cannot just say cui tronco. The article changes depending on the noun being possessed, which leads us to the next question!
Does the il in il cui agree with albero (tree) or tronco (trunk)?
It agrees with tronco (the possessed thing), not albero (the owner). This is a crucial rule to remember! Since tronco is masculine singular, we use il. Even if the owner was a feminine word like quella pianta (that plant), it would still be la pianta, il cui tronco... because the trunk itself remains masculine singular.
Why is "that tree" written as Quell'albero instead of Quello albero?
The adjective quello (that) changes its ending based on the word that follows it, very similarly to how the definite article (il, lo, la, l') works. Because albero is a masculine noun starting with a vowel, quello drops its final vowel and takes an apostrophe, becoming quell' (just like you would say l'albero instead of lo albero).
Why is it nel giardino and not in il giardino?
Whenever the preposition in is followed directly by a definite article, they always merge into a single word called an articulated preposition. The combination of in + il always forms nel.

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