Respuesta :
The last sentence because "even though" is a transitional phrase. When you begin with a transitional phrase, you always add a comma after beginning the second part of the sentence.
If you read my answer again, you'll see that i put a comma after "when you begin with a transitional phrase". Why? because the word "when" is also a transitional phrase; therefore, a comma is necessary.
If you read my answer again, you'll see that i put a comma after "when you begin with a transitional phrase". Why? because the word "when" is also a transitional phrase; therefore, a comma is necessary.