Questions & Answers about Compro un litro di latte.
Why use di instead of del for 'of milk'?
When you specify an exact quantity like un litro (a liter), you just use the simple word di (of). You only use del (some/of the) when you aren't giving a specific amount, like in the sentenceCompro del latte (I buy some milk).
How do I know if latte is masculine or feminine?
Latte is a masculine noun (il latte). Because it ends in -e instead of the typical masculine -o or feminine -a, you cannot tell its gender just by looking at it, so you have to memorize it.
How would this sentence change if I bought two liters of milk?
You would say Compro due litri di latte. The word for liter changes to its plural form litri, but the phrase di latte remains exactly the same.