Final answer:
The given sentence contains a dangling modifier. A dangling modifier occurs when the modifier does not have a clear or logical connection to the word or phrase it intends to modify.
Step-by-step explanation:
The sentence “Before moving to New York, Miami had been their home” contains a dangling modifier. A modifier is a word or phrase that modifies, or describes, another word or phrase in a sentence. A dangling modifier occurs when the modifier does not have a clear or logical connection to the word or phrase it intends to modify.
In this sentence, the phrase “Before moving to New York” is the modifier. However, it is not clear what is being modified. The sentence could be revised to remove the dangling modifier by specifying who or what was moving to New York: “Before they moved to New York, Miami had been their home.”