121. An adverb expressing place or direction is given the ending "-n"
when used with a verb expressing motion toward that place or direction
(69, 118, etc.):
Cxu li rajdis norden aux suden? Did he ride north or south(ward)?
Ni kuris antauxen, ne malantauxen, we ran forward, not back.
La bukedo falis eksteren kaj suben,
the bouquet fell out and underneath.
Li estis marsxanta hejmen, he was walking home (homeward).
[Footnote: The adverb may precede the verb and be united with it by
simple juxtaposition, if the resulting word is not too long: "Li
hejmeniris", he went home (he "home-went"). "Ni antauxeniros", we
shall advance (go forward). "La bukedo subenfalis", the bouquet fell
underneath.]