A simple way to remember is that All is with a plural noun + plural verb while Every is with a singular noun + singular verb
Although these topics are often covered in major style guides, sometimes the answers can vary
For example, “that is all” works
For the easy nouns, it works the same way: Singular: Less -- EVERY -- Every refers to all members of a group though considered individually
We use all, not all of, before indefinite plural nouns referring to a whole class of people or things: All cats love milk
'Girls" is the plural possessive
" (NB: The personal pronoun "you" can be both singular or plural
The English language groups grammatical nouns as either singular or plural
The AP Stylebook, the Chicago Manual of Style, Garner’s Modern English Usage, the Oxford English Dictionary, and the American Heritage Dictionary Usage Note
Writers often ask whether they should refer to a singular person whose gender is unknown as "he," "she," "he or she," "he/she," or "they