What is a sentence?
A sentence is a group of words, which have three important characteristics:
1. A sentence must express a complete idea.
2. A sentence must also have a subject and a verb.
3. A sentence must have meaning.
Read the full article here: https://learnenglishinnewyorkcity.blogspot.com/2020/04/how-to-make-simple-sentences-in-english.html