Here are some key characteristics of declarative sentences:
* They are the most common type of sentence.
* They always end with a period (.)
* They usually follow a subject-verb structure. (Example: *The cat sat on the mat.*)
* They can be simple or complex. (Example: *The cat sat on the mat.* vs. *The cat, who was very sleepy, sat on the mat.*)
Here are some examples of declarative sentences:
* The sun is shining.
* I like to eat pizza.
* The Earth is round.
* My dog is a golden retriever.
In contrast, other types of sentences like interrogative (questions), imperative (commands), and exclamatory (expressions of strong emotion) do not simply make statements.