Defintions of Simple, Compound, and Complex

A simple sentence, also called an independent clause, contains a subject and a verb, and it expresses a complete thought.In the following simple sentences, subjects are in yellow, and verbs are in green.
A. Some students like to study in the mornings.
B. Juan and Arturo play football every afternoon.
C. Alicia goes to the library and studies every day.

A compound sentence contains two independent clauses joined by a coordinator. The coordinators are as follows: for, and, nor, but, or, yet, so. (Helpful hint: The first letter of each of the coordinators spells FANBOYS.) Except for very short sentences, coordinators are always preceded by a comma. In the following compound sentences, subjects are in yellow, verbs are in green, and the coordinators and the commas that precede them are in red.
A. I tried to speak Spanish, and my friend tried to speak English.
B. Alejandro played football, so Maria went shopping.
C. Alejandro played football, for Maria went shopping.

A complex sentence has an independent clause joined by one or more dependent clauses. A complex sentence always has a subordinator such as because, since, after, although, or when or a relative pronoun such as that, who, or which. In the following complex sentences, subjects are in yellow, verbs are in green, and the subordinators and their commas (when required) are in red.
A. When he handed in his homework, he forgot to give the teacher the last page.
B. The teacher returned the homework after she noticed the error.
C. The students are studying because they have a test tomorrow.
D. After they finished studying, Juan and Maria went to the movies.
E. Juan and Maria went to the movies after they finished studying.

A phrase is two or more words that lack some semblance of both a subject and verb.

A complete sentence—no matter how brief. It works is a complete sentence!

Dependent clauses cannot stand on their own as complete sentences. Dependent clauses: A sandbox is a practice page on a wiki where you can become familiar with how wikis work.

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