Flashcards can be used to reinforce vocabulary and concepts taught in class. They should have clear, unambiguous drawings or images and be made of durable cardboard. Flashcards can be sorted into topics or sequences to facilitate finding specific cards. Teachers can use flashcards in various activities like warm-ups, substitution drills, guessing games, finding similarities and differences, and forming sentences to review material and consolidate learning. Working with flashcards in pairs or small groups allows nearly all whole-class activities to also be done collaboratively in a game-like format.