Certain adjectives, sometimes called Distributive, denote quantity taken individually. They are : each, every, and either, with its negative neither.

Sometimes, for emphasis, each and every are used together, but this expression should not be used where only one of these words sufficient.

Note that Each and Every take singular verbs.

Each one of you has (NOT have) to be ready by half past six. 

Every boy or girl swims twice a week.

Note: "Use a SINGULAR verb when two or more subjects connected by AND are preceded by EACH, EVERY, or MANY A." — Source: The Gregg Reference Manual.

“EVERY man AND woman IS born into the world to do something unique and something distinctive and if he or she does not do it, it will never be done.” — Benjamin E. Mays.

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