Both compound and complex sentences combine two (or more) clauses into one sentence. Complex sentences contain two unequal clauses. We use them to show more complicated relationships between two ideas.
Imagine that a friend asks you, “Did you see the odd-looking woman at the bank?”
You might answer, "I saw a woman. She was wearing a huge straw hat and a green and pink striped dress with black and white striped socks...”
It would sound better (less repetitive) to say, “I saw a woman who was wearing a huge straw hat (etc.)”
By converting two sentences into one complex sentence this way, we can vary sentence length and structure.
(Sentences of different lengths are more interesting to listen to than sentences that all sound the same). We can also show the relationship between ideas more clearly.
There are three kinds of complex sentences. The dependent clause can act as a noun. It can act as an adjective modifying a noun in the main (independent) clause. It can also act as an adverb modifying the main clause’s verb or the whole main clause.
Although a dependent clause contains both subject and verb, it cannot
serve as a sentence by itself.
The preceding sentence serves as an example.
The dependent clause begins with ‘although.’ It modifies (gives more information about) the independent clause that follows it.
“Although a dependent clause contains both subject and verb” is not a complete sentence but a fragment. It doesn’t express a complete thought. (Anyone listening would wait to hear the end of the thought. They would wonder, 'What is the speaker's point?')
Noun and adjective clauses often begin with ‘if, ‘that,’ or ‘wh’ words (who, what, when, where, why, which, whom, whose, whoever, whatever, whenever, wherever, etc.).
(Sometimes ‘who’ and ‘which’ can serve as the subject of a clause since they are pronouns. ‘That’ is often omitted.)
(Clauses acting as adjectives are often called 'relative clauses.' They often help define the noun in the main clause. They may also give extra information about it or specify which person or thing it refers to. See examples 3-5 below for each of these uses.)
Some examples (with the dependent clause in italics):
1. I know that he is untrustworthy. He lies whenever the truth is inconvenient. (or: Whenever the truth is inconvenient, he lies.)
2. I think (that) Joe would be the best for the job.
3. Steamships, which are large boats powered by steam engines, ended the 'Age of Sail.' (The dependent clause here defines what a steamship is.)
4. His father, who was otherwise very smart, never figured out how to use email.
5. Do you see the man who is carrying a black briefcase? (The dependent clause specifies which man,)
Adverb clauses begin with subordinating conjunctions. They show the relationship of the adverb clause to the independent clause.
They can show:
Some examples (with the dependent clause in italics):
1. Before I taught English, I worked in a library. (or: I worked in a library before I taught English.)
2. Some students listen to music while they study.
3. Although he finished the book, he still needs to study his notes on it.
4. Students in California cannot graduate from high school unless they pass the CAHSEE (exit exam.)
5. “I wouldn’t marry you even if you were the last man on earth!”
6. If you had a million dollars, what would you do with it?
7. “Try to act as if you were a civilized human being.” (This is sarcastic advice; don’t use it on a friend!)
8. Their corn crop failed because there was a drought.
9. Now that Tim’s an adult, his parents expect him to pay rent. They think (that) he should contribute to the household income while he’s living at home. (There are two dependent clauses in the second sentence.)
10. Is it fair to charge fees for services whether students use them or not?
Notice that either the dependent or the independent clause can begin the sentence. (They’re reversible.) If the dependent clause is first, it is followed by a comma.
Many subordinating conjunctions can also serve as other parts of speech. (For example, 'after' can be a preposition, as in "after the party.")
Note that ‘because of’ is a preposition. It should be followed by a noun phrase.
‘Because’ is a conjunction and must be followed by a clause with both subject and verb.
These are both correct:
However, it is not correct to say
Complex sentences are not difficult to understand if you recognize the meaning of each conjunction and clause. They are worth mastering.
You can practice complex sentences at Adverb Clause and Complex Sentence Practice. Other related pages:
Do you have questions about English sentence structure? Check out these explanations & examples of the word order for many kinds of sentences (including those with phrases and direct or indirect objects).
Compound sentences combine two independent clauses into one sentence. They're not hard with this explanation & a few examples!
How to form questions in English: a simple explanation with lots of examples using question words and helping verbs.
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