#help im confused by why lullabies itself is a not a modifier but rather an object. Is cats sing not a complete sentence? and in asking the question "what do they sing?" you would get lullabies as a modifier?

#help @7sage pls

im confused as to why #5 is 21 and older --> legal and not legal --> 21 and older.

thinking about subsets, how is 21+ a subset of if you're legally allowed to buy alcohol when those sets would be the same? isn't this more of a biconditional?

which one makes more sense:

To buy alcohol legally in the US, you must be 21 or older.

To be 21 or older you must be able to buy alcohol legally in the US.

I just don't understand why the legal portion is the necessary and not the 21 or older. we know that if the necessary condition happens on it's own, it doesn't mean that the sufficient has occurred, but this isn't the case here.

If you put "legally buy alcohol" as the necessary condition and take that by itself, we can ask the question of "can we say for certain that this person is 21 or older?" and the answer is yes, so i don't see why it's not the sufficient instead.

If you flip it around and have 21 or older as the NC, then can we say for certain that you can legally buy alcohol in the US? my thoughts is mostly yes (again confusion over biconditional), although maybe it's prohibition times and no one can buy alcohol. but we do know for certain that if you have purchased alcohol legally in the US then you are 21 or older. so i don't see why in the answer it is the opposite and it is causing my brain to mush.

#help