Why should I use the words "entire group of boys" instead of "entire boys". I know the first one is correct but can't explain why other than it sounds right. I need to explain why as part of a paper.
Entire means whole, all parts of.
Now, the entire group (of boys) means the whole group (as opposed to a part of the group), whereas entire boys means whole boys (as opposed to parts of boys — arms, legs, heads).
The entire car -> the whole car, tires, seats, engine, etc
The entire group of cars -> the whole group, every single car in the group