All and every are determiners.
We use both all and every to refer to the total number of something. All refers to a complete group. Every refers to each member of a complete group:
The questionnaire was sent to all employees.
The questionnaire was sent to every employee.
We can use every to focus on each individual member.
refers to the whole group
(We use their instead of his or her to refer back to a singular noun (passenger) because we are referring to both male and female passengers.)
focuses on each individual member of the whole group
We can use all, but not every, on its own without a noun. We use everyone/everybody/everything instead:
The meeting is at Oriel Hall. It begins at 8 pm and all are welcome.
every is welcome
Everyone is welcome to join the village social club.
All and every + nouns
The meaning of all and every is very similar but we use them in different ways. We use all with plural and uncountable nouns and every with singular nouns:
All donations will be sent to the earthquake relief fund.
All equipment must be returned by the end of June. (uncountable)
Every donation is appreciated.
We can use all and all of before determiners, but we don’t use every before determiners:
I invited all (of) my friends.
every my friends
All (of) the
We can use all and all of before articles (the, a/an), demonstratives (this, that) and possessives (our, his) but we can’t use every before them:
[talking about a library]
It has got all (of) the books that have ever been published.
It has got every the bookor It has got the every book
She’s gone to all (of) their concerts this year. She hasn’t missed one.
every their concerts
All day, every day
We use all day, all week, all month to mean ‘one entire day/week/month’:
We spent all day at the beach yesterday.
Every day (week/month) focuses on each individual day (week/month):
We spent every day at the beach in the holidays.
We spent all days at the beach
Fuel prices are rising every week.
Fuel prices are rising all weeks.
All or every: typical errors
We don’t use every before determiners:
He sold all (of) his books.
every his books.
We don’t use every with uncountable nouns:
All (the) information can be saved in the computer memory.
Every information can be saved…
We don’t use every with plural nouns:
We should organise a trip for all students.
for every students
We don’t use every on its own without a noun; we use everyone, everybody or everything instead:
He suggested cancelling the trip and everyone agreed.