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either i or u?
neither me nor u?
both me and you

either n neither
-negative
either = either .. or .., i'm not either
neither = neither .. nor .., me neither, neither am i

-positive
both = both .. and .., both of the/my/etc


for, to
to = exchange, transfer
for = beneficial

any, some
any = for question, for negative
some = positive

at, on, in
at = specific location, specific point
on = on surface, flat vertical, horizontal
in = enclose place, in the box

at, on, in
at = specific time, ex: 3.00 pm, midnight, noon
on = day, date, ex: sunday, september 3th, the new year's day
in = month, period, season, years, decades, ex: in 1995, in september, in the summer