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Subordinating Conjunctions

What are the main subordinating conjunctions? What is the difference between a coordinating conjunction and a subordinating conjunction? Do you use commas with subordinating conjunctions?

Subordinating Conjunctions
1) Conjunctions are words that link other words, phrases, clauses, or sentences together.

Susan is an amazing wife and a wonderful mom.

2) There are many types of conjunctions. Among them there are subordinating conjunctions. They link two clauses, a main (independent) one and a subordinate (dependent) one.

Although Emma wanted to go together with them, she declined the invitation.

The most commonly used subordinating conjunctions are although, as, because, if, since, though, unless, while, whereas etc.

Subordinating conjunctions perform two functions in a sentence: they state the importance of the independent clause and provide a transition between two ideas within a sentence.

[Once she stopped caring about strangers’ opinions]2, [Liz became happier]1.
1 – main clause, 2 – subordinate clause

If the subordinate clause follows the main one, we do not usually use a comma.

[My mom cries]1 [whenever she watches a romantic comedy]2.
1 – main clause, 2 – subordinate clause

If the subordinate clause precedes the main one, use a comma to separate the clauses.

[After he had completed his studies]2, [George decided to travel for a year]1.
1 – main clause, 2 – subordinate clause

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