Everyone and everybody mean the same thing, but some questions in this unit only accept everyone and some only accept everybody. This lesson is exhausting trying to remember which go with which
원해 많이 많이, 많이 많이
Would 모두 이것을 다 원해요 have the same meaning or slightly different?
모두 다 is a bit redundant but commonly used. I guess it's like an emphasis. Your moving of 다 makes the thing sound plural, like "Everybody wants all of this."
What is the purpose of 다 here. is the 다 All?
yes it is.
Since 모두 can be both "everybody" and "everything," do you just have to differentiate them from context?