1. Preposition:
* Of: "El libro de Juan" (John's book).
* From: "Vengo de la escuela" (I'm coming from school).
* To: "Voy de Madrid a Barcelona" (I'm going from Madrid to Barcelona).
* With: "Estoy de acuerdo con tu plan" (I agree with your plan).
* In: "Estamos de vacaciones" (We are on vacation).
2. Part of contractions:
* Del: (de + el) "El libro del niño" (The child's book).
* De la: (de + la) "La casa de la playa" (The house on the beach).
* Della: (de + ella) "La hermana della" (Her sister).
* Dello: (de + ello) "El peso dello" (Its weight).
3. Used in expressions:
* De repente: (suddenly)
* De acuerdo: (okay, agreed)
* De nada: (you're welcome)
* De verdad: (really, truly)
4. To indicate possession:
* "La casa de mis padres" (My parents' house).
5. To indicate origin or material:
* "Un vestido de seda" (A silk dress).
* "Soy de España" (I am from Spain).
The best way to understand the meaning of "de" is by looking at the context of the sentence.
Do you have a specific sentence in mind where you'd like to know the meaning of "de"? I can help you understand it better!