wide range of structures

The ability to use simple, compound, complex, and compound complex sentence structures.

A simple sentence consists of a single independent clause with no dependent clauses. For example: The woman walked.
 
A complex sentence consists of at least one independent clause and one dependent clause. For example: The child waited for her mother.
 
A compound sentence consists of multiple independent clauses with no dependent clauses. These clauses are joined together using conjunctions, punctuation, or both. For example: The woman walked and the child ran.
 
A complex compound sentence (or compound complex sentence) consists of multiple independent clauses, at least one of which has at least one dependent clause. For example: The woman, who was the child’s mother, walked to the park while the child ran ahead.
 
Reference: http://en.wikipedia.org/wiki/Sentence_(linguistics)

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