Independent or dependent: The pony express did not last long.

Independent or dependent: Mail was carried by ships.

Independent or dependent: Because today's mail travels so slowly.

Independent or dependent: The pony express riders would often ride throughout the night.

Independent or dependent: While they were called pony boys.

Independent or dependent: When they carried the mail.

A subordinating conjunction links a dependent clause to an independent clause.

Fill in the blank with the correct subordinating conjunction: _____ he is here, he may as well stay for lunch.

Fill in the blank with the correct subordinating conjunction: ________________ I had seen that movie three times, I watched it again.

Fill in the blank with the correct subordinating conjunction: Don't go out ___ you've finished your work.

Fill in the blank with the correct subordinating conjunction: Make sure you close all the windows ___ it starts to rain.

Identify the subordinating conjunction: I put the fish in after I filled the tank.

Identify the subordinating conjunction: Our new house is bigger than our old house.

Identify the subordinating conjunction: Since Robin refused to wear his seat belt, Batman has banned him from the Batmobile.