A complex sentence begins with a subordinate clause. Here are a few more subordinating conjunctions that you can use to begin a subordinate clause: although, since, unless, until, if
When you begin a complex sentence with a subordinating conjunction, you must put a comma after the subordinate clause, like this.
Although is is Monday, we don’t have school today.
Until the bus arrives, we have to sit and wait.
Unless you can find the key, we won’t be able to drive to school.
If the power goes off, we need to stock the cooler.
A complex sentence begins with a subordinate clause, and a subordinate clause begins with a subordinating conjunction (a subordinate clause word – such as although, since, unless, until, if. Use a comma after the subordinate clause in a complex sentence.
▶It’s your turn. Place a comma into this complex sentence. Since you have the car you can give me a ride home. Did you figure out that the comma goes after car? Good for you.