Simple Sentences:
* The cat chased the mouse. (The cat is the subject noun, performing the action of chasing.)
* My friend loves to dance. (My friend is the subject noun, performing the action of loving.)
* The sun shines brightly. (The sun is the subject noun, performing the action of shining.)
* Rain falls from the sky. (Rain is the subject noun, performing the action of falling.)
Complex Sentences:
* The children who were playing in the park were laughing. (The children is the subject noun, performing the action of laughing.)
* The book that I read was very interesting. (The book is the subject noun, performing the action of being interesting.)
* The man with the red hat walked quickly. (The man is the subject noun, performing the action of walking.)
More Examples:
* Dogs bark.
* The teacher explained the lesson.
* The car stopped abruptly.
* The music played softly.
* Hope springs eternal.
* The United States is a large country.
Remember:
* The subject noun usually comes before the verb in a sentence.
* It can be a singular or plural noun.
* It can be a proper noun (like a person's name) or a common noun (like a general thing).
Let me know if you want more examples or have any other questions!