Final answer:
The phrase "To ride a bike" is a fragment and not a complete sentence, run-on, or example of figurative language. A complete sentence requires at least a subject and a verb that expresses a complete thought, unlike the given phrase.
Step-by-step explanation:
The phrase "To ride a bike" is neither a run-on sentence, nor does it demonstrate figurative language; it is a fragment because it lacks a complete thought and the necessary components of a complete sentence, which include at least a subject and a verb that expresses a complete thought.
An example of figurative language might be a sentence like: "Learning a foreign language is like learning to ride a bicycle: you must learn to perform multiple tasks at the same time." This particular sentence uses a simile comparing the process of learning a foreign language with learning to ride a bicycle.
On the other hand, a run-on sentence would improperly combine two or more complete sentences without appropriate punctuation or conjunctions. It might look like this: "He's running he just learned how to ride a bike," which lacks the necessary punctuation between the two independent clauses.