Basic Structure for English Sentence

The basic sentence structure must contain:

Subject ———————— verb ———————————— object

as simple as:
I love you, he is eating the chicken, Dahlia is reading a book.

According to thought co,the subject is usually a noun—a word that names a person, place, or thing. The verb (or predicate) usually follows the subject and identifies an action or a state of being. An object receives the action and usually follows the verb.

Credit to ESL Goal, the picture taken from 

For more basic grammar, need to know more about nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections.