This Microsoft Word file contains 20 flashcards with complete Spanish sentences that students can use in a variety of ways. You can see the first ten flashcards in the thumbnails.
Here are some ideas that have worked well for my classes:
1. Print the cards back-to-back on cardstock or colored paper, and cut them out (or have students help you). Have students sit by a partner, and they each take 10 of the 20 cards. Partner A shows the English of a flashcard, and Partner B has to correctly say/write the Spanish translation. Partner A has the answer right on the back of the card to check the answer. Then, they switch roles, and keep taking turns until they've gone through the whole pile. When they get cards correct, they take them out of their piles, and they have to re-try cards they get wrong the first time.
2. Don't print the flashcards back-to-back, so you have 20 English-only cards and 20 Spanish-only cards in a set. Give a set to each group of two students, and when you count to three, each group tries to match cards up as fast as they can. The first five groups to finish win!
3. Again, don't print the flashcards back-to-back, and have students play Memory with them.