Some examples of subordinating conjunctions would be the following:
As the cake baked in the oven, Will mixed the frosting.
Since I started eating breakfast every day, I have had much more energy.
I am going to bed early because my flight leaves at 7:00 a.m. tomorrow.
The outdoor concert was so much fun even though it was raining.
I cannot watch the new episode until I catch up on the first season.