Question

select the dependent clause.
after francis scott key witnessed an intense british attack on fort mchenry during the war of 1812, he wrote the words to \the star - spangled banner,\ the national anthem of the united states of america.
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Explanation:

A dependent clause (also called a subordinate clause) is a group of words that has a subject and a verb but cannot stand alone as a complete sentence. It usually starts with a subordinating conjunction (such as after, because, if, etc.). In the given sentence, After Francis Scott Key witnessed an intense British attack on Fort McHenry during the War of 1812 starts with the subordinating conjunction after and has a subject (Francis Scott Key) and a verb (witnessed), but it cannot stand alone as a complete sentence. The main clause is he wrote the words to "The Star - Spangled Banner," the national anthem of the United States of America.

Answer:

After Francis Scott Key witnessed an intense British attack on Fort McHenry during the War of 1812