Final answer:
The verb soler + infinitive follows the pattern of o-ue stem-changing verbs.
Step-by-step explanation:
The rule for the verb soler + infinitive (o-ue) is that it follows the pattern of o-ue stem-changing verbs.
For example, the verb soler (to be accustomed to) becomes suelo (I usually do) in the present tense.
Another example is soler + infinitive: suelo estudiar (I usually study).
Learn more about Spanish verb conjugation