Introductory participial phrases and adverb clauses are set off from main clauses by commas. This statement is true.
An introductory participial phrase introduces a sentence's main clause, offering context to aid understanding. It is a verb phrase that might or might not have a direct object. A comma follows a participatory phrase.
In complex sentences, a comma is used after an introductory subordinate clause or dependent clause, which acts as an adverb clause. Subordinating conjunctions, including although, after, while, if, when, till/until, since, before, and so on, follow adverb clauses. Some subordinating conjunctions, such as until, before, and after, can act as prepositions as well as subordinating conjunctions.
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