Final answer:
The form 'stem-changer car- qué' is not a part of the present tense; it is a spelling change that occurs in the preterite tense to maintain the hard 'c' sound in verbs ending in -car.
Step-by-step explanation:
The question asks to identify which form is not a part of the present tense in Spanish. Among the listed options, the correct answer is stem-changer car- qué. This change occurs in the preterite tense, not in the present tense. In the present tense, verbs ending in -car do not undergo this spelling change, they change in the yo form of the preterite to maintain the hard 'c' sound (e.g., buscar becomes busqué).
In summary, forms pertaining to the present tense include regular verbs, irregular verbs including irregular yo forms (go-go) and stem-changers (o-ue and e-ie), and reflexive verbs. The change from car to qué is specific to the preterite tense, which is a past tense form, and hence is not part of the present tense conjugation patterns.