Commas in Complex Sentences

As I was walking home from school

After I finished my benchmark

While I was waiting for my sister

Until I was five years old

Before I went to bed

I saw two dogs fighting in the alley.

I lay my head down on my desk.

I saw a red Lambouragini speed through the street.

I did not remember any of my birthdays.

I made sure that my backpack was at the front door.

As I was walking home from school, I saw two dogs fighting in the alley.

The dependent clause is in red.

I lay my head down on my desk after I finished my benchmark.

The dependent clause is in red.

No comma in between when the dependent clause comes after the independent clause.

While I was waiting for my sister, I saw a red Lambouragini speed through the street.

I saw a red Lambouragini speed through the street while I was waiting for my sister,