Time:
* after (e.g., "After she finished her homework, she went to bed.")
* before (e.g., "Before we left, we packed our bags.")
* since (e.g., "Since you've been gone, I've missed you.")
* when (e.g., "When I saw her, I smiled.")
* while (e.g., "While I was eating, the phone rang.")
* as soon as (e.g., "As soon as I saw the car, I knew it was hers.")
* until (e.g., "We waited until the rain stopped.")
Cause and Effect:
* because (e.g., "I stayed home because I was sick.")
* since (e.g., "Since it was raining, we stayed inside.")
* so that (e.g., "I studied hard so that I could pass the test.")
* as (e.g., "As the sun went down, it got colder.")
Contrast:
* although (e.g., "Although it was cold, we went for a walk.")
* though (e.g., "Though he was tired, he finished the race.")
* even though (e.g., "Even though it was raining, we enjoyed the picnic.")
* while (e.g., "While I like pizza, my brother prefers burgers.")
Condition:
* if (e.g., "If you study hard, you will succeed.")
* unless (e.g., "You won't get a good grade unless you study.")
* provided that (e.g., "Provided that you agree, I'll come.")
* in case (e.g., "I brought an umbrella in case it rains.")
Comparison:
* as (e.g., "She is as tall as her mother.")
* than (e.g., "He is taller than his brother.")
Other:
* where (e.g., "I went to the store where I bought my shoes.")
* how (e.g., "Do you know how to get there?")
* why (e.g., "I understand why you're upset.")
Remember that subordinating conjunctions introduce dependent clauses, which cannot stand alone as a complete sentence. They must be connected to an independent clause to form a complete sentence.