Hi! Remember that I told you I like Norah Jones? She <u>is an amazing singer</u> (predicate noun/nominative). She also <u>writes the deepest, most beautiful lyrics</u> (predicative adjective, compound).  Besides, she <u>started singing very young</u> (predicative adjective), she <u>was only seven years old</u>! (predicate noun). I recommend you to listen to her first album, and hopefully you will talk to me about your favorite singer, too. 
Bye!
 
        
             
        
        
        
"The" boy was walking his dog
        
             
        
        
        
A proper noun is just a specific noun and starts with a capital letter. Some suggestions: Honda Civic. McDonald's. (Your name). Texas. Grand Theft Auto. The Hunger Games. (Your teacher). Time Magazine. Red. Despicable Me. I hope this helps :)
        
             
        
        
        
What do you need help with? Also, I dont think that is a simple sentence.