"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.
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.
She made a long phone call. Mom will call us when dinner is ready.
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."