bob: hey willy you want to ketchup?
willy: no
bob: why not?
willy: no
(1)no.
(2)its a sentence in itself.
(3) something most people cant say
1.no, means no, get over her dood.
2.sorry, but its a no!
3.no.
4.please, no.
5. no mommy I wanted a black Lambo, you got me a dumb red one!
6. no stupid that is a dog not a duck!
is the opposite of yes
"do you want a sandwich" - person 1
"no." - person 2