Examples
hablar (to speak) - habla - speak! comer (to eat) - come - eat! vivir (to live) - vive - live! pensar (to think) - piensa - think! volver (to return) - vuelve - come back! dormir (to sleep) - duerme - sleep!
fumar -> fumas - ¡No fumes! - Don't smoke! correr -> corres - ¡No corras! - Don't run!