1. Short form: Demonstrative adjectives can be written in their short form, which consists of only one word. The short form of demonstrative adjectives is used when the noun they are modifying is immediately adjacent to them.
For example:
- El niño _este_ es muy inteligente. (This boy is very intelligent.)
- La casa _aquella_ es muy grande. (That house is very big.)
2. Long form: Demonstrative adjectives can also be written in their long form, which consists of two words. The long form of demonstrative adjectives is used when the noun they are modifying is separated from them by one or more words.
For example:
- El niño _este mismo_ es muy inteligente. (This very boy is very intelligent.)
- La casa _aquella misma_ es muy grande. (That very house is very big.)
Notes:
- The short form of demonstrative adjectives is used more frequently than the long form.
- The long form of demonstrative adjectives can be used to emphasize the noun they are modifying.
- Demonstrative adjectives must agree in gender and number with the nouns they are modifying.