Make a complex sentence starting with the subordinating conjunction "Unless"
Unless I finish my homework, I can't go to the party.
Make a complex sentence starting with the subordinating conjunction "Before"
Before you go for a walk, sit down in the stroller.
Make a complex sentence starting with the subordinating conjunction "After"
After I called my friend, we met at the park.
Make a complex sentence starting with the subordinating conjunction "Before"
Before you go to bed, brush your teeth.