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The correct way to punctuate the sentence provided for it to be a complex sentence is "When my favorite song comes on, let me know," as explained below.

What is a complex sentence?

A complex sentence is comprised of two clauses, a dependent and an independent one. Let's break their definitions down below:

  • An independent clause is a group of words containing a subject and a predicate that can stand alone as a sentence. It conveys a full thought.
  • A dependent clause also contains a subject and a predicate, but it does not convey a full thought. It begins with a subordinating conjunction.

Examples of subordinating conjunctions are:

  • When
  • Because
  • After
  • Before
  • While

The complex sentence provided in the question can be broken down into:

  • Independent clause: Let me know.
  • Dependent clause: When my favorite song comes on.

We must place a comma separating the two clauses when the sentence begins with the dependent clause. Therefore, the correct way to punctuate the complex sentence is:

  • When my favorite song comes on, let me know.

With the information above in mind, we can conclude that the answer provided above is correct.

Learn more about complex sentences here:

https://brainly.com/question/17538242

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