Simple Sentences:
* The cat sat on the mat.
* My name is John.
* She likes to eat pizza.
* The sun is shining.
* We went to the park.
Compound Sentences:
* The cat sat on the mat, and the dog watched him.
* It was a beautiful day, so we went for a walk.
* I like to eat pizza, but I don't like mushrooms.
* He went to the store, and he bought some milk.
* She went to bed early, because she was tired.
Complex Sentences:
* Because the cat sat on the mat, the dog couldn't get close.
* Although she likes to eat pizza, she rarely orders it.
* When I went to the park, I saw a squirrel.
* I am going to the store, even though I don't need anything.
* He left early, so that he could avoid traffic.
Sentences with Modifiers:
* The big, fluffy cat sat on the red mat.
* My name is John, and I am a student.
* She really likes to eat pizza, especially pepperoni.
* The sun is shining brightly today.
* We went to the park, which is located near our house.
Key features of declarative sentences:
* They make a statement.
* They end with a period (.).
* They are usually arranged in subject-verb-object order.
Let me know if you would like more examples or have any other questions!