All and every can both be used to talk about people or things in general, or
about all the members of a group. There is little difference of meaning; every often suggests ‘without exception’. The two words are used in different structures.
Every with singular nouns; all with plurals
Every is used with a singular noun. To give the same meaning, all is used with a plural noun.
– Every child needs love. (NOT
All child needs love.)
All children need love.
– Every light was out.
All (of) the lights were out.
Every not used with determiners
We can use all (of), but not normally every, with certain determiners (articles, possessives or demonstratives).
– All (of) the plates were broken.
Every plate was broken. (NOT
Every the plate / The every plate … )
– I’ve written to all (of) my friends.
I’ve written to every friend I have. (NOT … every my friend/ my every friend.)
All can be used with uncountables
We can use all, but not every, with uncountable nouns.
I like all music. (NOT …
All day and every day
Note the difference between all day/week etc and every day/week etc.
She was here all day. (= from morning to night)
She was here every day. (Monday, Tuesday, Wednesday, … )