Final answer:
In Spanish, we use the prepositions 'a' and 'de' with the appropriate forms of the definite article to indicate movement or origin/possession. 'A' is used when we go to a place, and 'de' is used to express origin or possession. We use the contraction 'al' when the place starts with 'el.'
Step-by-step explanation:
When talking about going to a place, we use the preposition 'a' to indicate movement towards a specific location. In this case, the sentence is 'Cuando necesito ropa nueva, voy a la centro comercial.' This means 'When I need new clothes, I go to the mall.'
However, when we talk about going to a place that starts with the article 'el,' we use the contraction 'al' instead of 'a el.' So, if the sentence was 'Cuando necesito ropa nueva, voy al cine,' it would mean 'When I need new clothes, I go to the movies.'
When talking about the origin or possession of something, we use the preposition 'de.' In the sentence 'Cuando necesito ropa nueva, voy de la tienda de ropa,' it means 'When I need new clothes, I go to the clothing store.'
Learn more about The use of prepositions 'a' and 'de' with definite articles in Spanish