Clauses are large grammatical units composed of many parts of speech. They always contain a subject and a verb, as well as any number of modifiers.
Here are some examples of clauses:
When the weather improves a bit
I love pogo sticks
Have you met my friend James?
Although in principle I like the colour mauve
Each of these clauses consists of a number of parts of speech and phrases that together make up an idea. Some of the examples can be complete sentences by themselves and others cannot.
When a clause can stand by itself it’s called an independent clause. When it has to be connected to another clause it’s a dependent or subordinate clause.
Every independent clause has one subject and one verb and can function as a complete sentence. Here are a few examples:
I love online learning.
Tears trickled down his cheeks.
The cat ate the goldfish.
Subject: The cat.
While this may seem basic, the one thing that gives students trouble is when you use a coordinating conjunction to connect clauses:
Stalagmites grow up and stalactites hang down.
I couldn’t decide whether to purchase Adobe Illustrator or Corel Draw, so I bought them both.
In these cases you should not consider the coordinating conjunction as part of either clause. It just sits in between the independent clauses.
As you’ll read below, the opposite is true of subordinating conjunctions.
A dependent clause cannot be a complete sentence by itself. That’s because it starts with a word that connects to a main clause. Often the word is a subordinating conjunction or a relative pronoun:
Subordinating conjunction: when, while, although, because, since, etc.
Relative pronoun: who, which, whose, whom, what, that
Dependent clauses that start with a relative pronoun are called relative clauses.
A dependent clause, then, cannot be a sentence by itself:
While I shot the sheriff
Which everyone saw
Who talked to me
Note that the relative pronoun not only connects the dependent clause, but often also acts as its subject. After all, every clause has to have a subject and a verb.
Now let’s see how we can add these dependent clauses to a sentence:
As my father used to say, the apple does not fall far from the tree.
The capybara, which is native to South America, is the largest rodent in the world.
Note that in the second example the dependent clause interrupts the main clause and provides more information about a noun phrase (“The capybara”).
We all combine clauses intuitively, but recognizing how it works will help you write balanced and complex sentences.