What type of usage error is present in the sentence "He liked to play basketball and riding horses"?

The identified issue in the sentence "He liked to play basketball and riding horses" is an example of faulty parallelism. This occurs when elements in a list or series do not match in grammatical structure. In this case, "to play basketball" and "riding horses" are not parallel phrases; the first is an infinitive phrase ("to play") while the second is a gerund phrase ("riding"). To correct the parallelism, both elements should be structured similarly. For instance, the sentence could be adjusted to "He liked to play basketball and to ride horses," creating a consistent grammatical form throughout the list. By maintaining parallel structure, the sentence becomes clearer and more effective in conveying the intended meaning.