3. Identify the correct statement.

When a complex sentence begins with a dependent clause, put a comma after the clause.(My answer)
When a complex sentence begins with an independent clause, put a comma after the clause.
In a compound sentence, put a comma after the coordinating conjunction

Right

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To identify the correct statement regarding the use of commas in complex and compound sentences, we need to understand the rules for punctuation in these scenarios.

A complex sentence is a sentence that includes an independent clause and one or more dependent clauses. When a complex sentence begins with a dependent clause, a comma is typically placed after the clause. This is done to indicate the separation between the dependent clause and the independent clause that follows it.

For example:
"When I go to the store, I always buy groceries."

In this example, "When I go to the store" is the dependent clause, and "I always buy groceries" is the independent clause. The comma is used to separate the dependent clause from the independent clause.

On the other hand, when a complex sentence begins with an independent clause, no comma is needed immediately after that clause. So, the statement "When a complex sentence begins with an independent clause, put a comma after the clause" is incorrect.

A compound sentence, on the other hand, is a sentence that consists of two or more independent clauses joined together with a coordinating conjunction (such as "and," "or," "but," etc.). In a compound sentence, a comma is typically used before the coordinating conjunction. This is known as a comma before the coordinating conjunction rule.

For example:
"I went to the store, and I bought some groceries."

In this example, "I went to the store" and "I bought some groceries" are both independent clauses joined by the coordinating conjunction "and." The comma before "and" indicates the separation between the two independent clauses.

Therefore, the correct statement regarding the placement of commas in complex and compound sentences is: "When a complex sentence begins with a dependent clause, put a comma after the clause."