"Mom cooked dinner." is indeed a complete sentence. It contains all parts of a complete sentence.
In the sentence Mom made dinner:Mom is the subjectmade is the verbdinner is the objectShe made dinner - She is a pronoun subject.
Mom cooked a big turkey for supper.
It's a compound sentence, with two independent clauses connected by the conjunction "and."
Nothing is wrong the sentence is good
My mom gave us a lovely cheesecake dessert after dinner.
To call us in for dinner, Mom used to ring an iron triangle.
i had a dark and hueless day today, remarked mom as she sat down to eat dinner.
My mom told me to go to the store to buy food for dinner and so I did.
She made a long phone call. Mom will call us when dinner is ready.
Capitalization is important. It gives clarity to the thoughts that the sentences convey. Examples. Her mom, Mrs. Cooks ate spaghetti for dinner. Her mom cooks spaghetti for dinner.
A fragment in language arts (grammar/ILA) is basically a part of a sentence (a couple of words) that can't stand alone. It's similar to a clause. Here are a couple examples: 1) The cat ate 2) My mom 3) When I grow up I hope this really helped! :)
"Hey, mom, what is for dinner?" "I am baking yesterday's stew in a pot pie."