Vídeo: Practicando los verbos -er e -ir #1 y las tarjetas para jugar: Regular and irregular preterite tense verb cards. The cards you are given in class are already printed on particular colours: blue for -ar, green for -er, yellow for -ir. These match the posters on the walls and the sheets in your book. If you’re printing these cards yourself on white, the coloured dots do the same job to help you work out which ‘group’ the verbs are from. The ones with no dot are irregular verbs.