These flashcards can be used with any verb. The heartbeat indicates a verb, the heart of a sentence. You provide the infinitive and students need to give the correct form of the verb provided. Groups can have different subject pronouns, you can assign a subject pronoun to students as they come in to class, with the infinitive verb already on the board, etc.. There are infinite ways to use them. I encourage you to print them on card stock and have them laminated.