All
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Although these three words are often used to refer to a group of things, "each" and "every" always use the singular form of the verb.
- Each employee has a key.
- Every employee has a key.
- Each of the employees has a key.
- All the employees have a key.
- All the employees have keys.
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Each / Every
"Every", not "each", is more commonly used when refering to time: seconds, minutes, hours, days, weeks, months, seasons, holidays etc.
- We go to my parents' house every Christmas.
- You should take this medicine once every eight hours.
- Every time he sees that film it reminds him of his childhood.
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Each Other / One Another
To express that an action is reciprocal or mutual we use the expressions "each other" or "one another".
- He wrote to her and she wrote to him. They wrote to each other. They wrote to one another.
Exercise: All - Every - Everything 1
Related Articles: All over

