Lesson Plan Instructions
Begin with a quick review of the demonstrative adjectives, doing a warm up exercise by pointing to objects around the room, on desks, students' property or clothing and make statements and ask questions, such as:
¿Te gusta ese suéter? [speaking to one student of someone else's sweater]
¿Dónde compraste esta mochila? [speaking directly to the owner of the backpack]
Write the forms of the demonstrative adjectives on the board -- with a caption above: Demonstrative Adjectives.
Next, in English, start asking similar questions, but this time, you'll introduce the use of the English structure that answers to the Spanish use of demonstrative pronouns. Tell them they are going to learn what else they can do with demonstrative adjectives. Start with a statement, using demonstrative adjectives to establish what the noun is, then follow up with a question in which the adjective that identifies another object of its class is used alone. This is known as substantiation - making an adjective a noun or pronoun:
That backpack is big. Is this a bigger or smaller one?
This green is book pretty. What do you think of that blue one?
Write one of these statement/question combinations on the board and ask them to identify the demonstrative adjective in the statement. Then point out that the word this or that, as in the follow-up questions above, are not followed by a noun, but rather either are alone or point to an adjective.
Tell them that in Spanish, almost the same thing happens -- only it's simpler, because there is no need to add a word like one to make this happen. Tell them that the demonstrative adjective is used in such a way that they can imagine that it has swallowed up the noun. In the process, by replacing a noun, the adjective has become a.... pronoun.
At this point, erase the word Adjectives in the caption on the board, replace it with Pronouns. Then place the accent marks over the correct vowels and tell them that demonstrative pronouns sound exactly like the demonstrative adjectives, but that when writing them, the accents must be used.
Model a few sentences, ideally, the same ones you used in English and then you can do drills in Spanish using objects in the room to make statements and ask questions.