Dormir and morir are irregular in El Pretérito Indefinido but both follow the same pattern replacing the -o- with a -u- in the 3rd person singular and plural (ella/ él/ usted and ellas/ ellos/ ustedes):
| yo | dormí |
| tú | dormiste |
| él / ella / Ud. | durmió |
| nosotros | dormimos |
| vosotros | dormisteis |
| ellos / ellas / Uds. | durmieron |
Read and listen to these examples:
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