people just use forget
i forget to do my homework
2 Answers
Se me olvidó hacere mi tarea. - Se me olvida hacer mi tarea. The former for a specific occasion, and the latter for a general tendency. Neither is likely to win much sympathy from your teacher.
"I forgot to do my homework." (preterito)
Or, another good excuse: "My dog ate my homework."
If you are looking for a sentence that uses 'forget', then...
"I cannot remember your name, but I never forget a face."
No puedo recordar tu nombre, pero no me olvidé una cara.