Answer:
I'm not sure what you're asking here. ALL dependent clauses -- if they begin the sentence -- MUST take a comma after them. Typically, you can identify dependent clauses because they begin with adverbs.
Explanation:
Example:
When starting a sentence with a dependent clause, use a comma after it.
After I graduate from college, I will get married.
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If the dependent clause comes AFTER the independent clause, then no comma is needed.
Example:
I will get married after I graduate from college.