To complete the sentence "Symbols zapatos son muy bonitos" with the correct demonstrative adjective "these," you would use the Spanish word "estos" as the demonstrative adjective.
Here's how it works:
1. The Spanish demonstrative adjectives agree in gender and number with the noun they modify. In this case, "zapatos" is a masculine plural noun.
2. The Spanish word for "these" when referring to masculine plural nouns is "estos."
Therefore, the correct sentence would be:
Estos zapatos son muy bonitos.