Learn more about Grammar:
Adjectives: An Easy Guide with ExamplesAdverbial Clauses: What Are They?AdverbsAnalogy: Definition & Meaning (with Examples)ArticlesBad AdverbsClauses: Definition, Meaning, and How to Use ThemConjunctionsCoordinating Conjunctions: What Are They and When Should You Use Them?Dangling ModifiersDeclarative Sentence: Examples + MeaningExaggerationHomophones: Definition and ExamplesHow to Use Subordinating ConjunctionsInfinitivesInterjections: Definition, Meaning, and ExamplesIntransitive Verb: Definition, Meaning, and ExamplesNounsParticiples PluralsPrepositional Phrase: What Is It & How to UsePrepositionsSplit Infinitive: The Complete Guide (with Examples)Subordinate Clause: Definition, Types, and ExamplesThe Complete Guide to Transitive VerbsTransitions: A Complete Guide (with 100+ Examples)Types of VerbsVerbsWhat is a Pronoun? Rules and ExamplesWhat Is Symbolism in Writing?Word ClassesWhich version of the verb should be used with "every"?

Every added to a noun makes it act as a singular. This includes "everyone", e.g. Everyone likes Saturdays.
When you use "every" with a verb, you should use the third person singular (he/she/it) version of the verb, e.g. For every action, there is an equal and opposite reaction.
Sometimes, every can be used to modify a combine noun, e.g. Every boy and girl has to take part. Here, "every" takes the whole subject chunk "boy and girl" and makes it singular. Again, you should use the third person singular version of the verb, has, not have.
Examples of every in a sentence
But on this, as on every other point, Mimi had been adamant.- Seeing Stars by Diane Hammond
It was what she dreamed about every night before she fell asleep;- Seeing Stars by Diane Hammond
She was off-book, like Mimi had told her to be for every audition.- Seeing Stars by Diane Hammond
Every time she’d been in the studio there were pizza boxes scattered around like C-rations.- Seeing Stars by Diane Hammond