A sentence must have a subject and a verb, and must make a complete idea.
Example: I went to the store

This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Sentence -word or group of words
-has subject + predicate
-begins with a capital letter and ends with punctuation mark (.) (!) (?)

Fragment -word or group of words
-either no subject or no predicate
-does not express