Children will learn some of the most basic Spanish words if you use the words in daily conversation. When children arrive in the morning, say "Buenos dias." When the children leave at night, say "Buenas noches." or "Adios." Look up the Spanish names for all the activities you commonly do in the classroom, then use these words when it's time to play. For instance, at book time ask each child to choose a "libro" from the shelf. This method helps children learn the context in which words and phrases should be used.
Pairing Spanish words with a familiar tune and rhythm will help children memorize the words and learn to pronounce them. Borrow a CD of Spanish children's music from the library. Look for songs that your students know in English. Since they already know the meaning of the song in English, children can make guesses about what the lyrics in the Spanish version mean. You may also write your own Spanish lyrics to accompany a familiar tune if you're trying to teach students specific vocabulary words.
Any opportunity to read books with preschoolers gives them exposure to letters and words, improving their literacy skills. Using books to teach children about Spanish is like giving the children a double helping of learning. Your local library should have some picture books featuring Spanish words, but you can also use books that you already own to teach children new words. Choose board books that show English words in large print, then write the same words onto sticky notes and attach the words on top of the English words. As you go through the book with children, say each Spanish word and reveal the English translation underneath.
Although parents may restrict letting children watch television, preschoolers can actually learn language skills from some videos and television shows. Many educational shows such as "Sesame Street" or "Dora the Explorer" include characters who speak Spanish. These shows may also show the written versions of these words so children can learn to match the sound with the word. Make the most out of these shows by using the new vocabulary in conversation with children after the TV is turned off.