Final answer:
Certain Spanish verbs have stem changes in the preterite tense. The verbs 'decir' and 'traer' have 'aj' in their preterite stem change.
Step-by-step explanation:
In Spanish, there are certain verbs that have stem changes in the preterite tense. Two verbs that have 'aj' in their preterite stem change are decir and traer. In the preterite tense, the stem of decir changes from 'dec-' to 'dij-' and the stem of traer changes from 'tra-' to 'traj-'. For example, in the preterite tense, 'él dijo' means 'he said' and 'yo traje' means 'I brought'.
Learn more about Spanish verb conjugation