Final answer:
The sentence "You can ride a bike, can't you?" requires a comma after the word "bike" to separate the two independent clauses.
Step-by-step explanation:
The sentence "You can ride a bike, can't you?" requires a comma after the word "bike" to separate the two independent clauses. The comma serves to indicate a pause and to clarify the meaning of the sentence. Here is the corrected sentence: "You can ride a bike, can't you?"
Learn more about Punctuation in English sentences