doni, to give, re'doni, to give back; iri, to go, re'iri, to go again.
diri, to say, re'diri, to repeat; veni, to come, re'veni, to return.

SUFFIXES.

'ad'—denotes duration or continuation of an action:

spiri, to breathe, spir'ad'o, breathing.
pafi, to fire (a gun, etc.), paf'ad'o, a fusilade.

'aĵ'—denotes a thing having a certain quality, something made from a certain matter:

mola, soft, mol'aĵ'o, a soft thing or substance.
ovo, egg, ov'aĵ'o, omelet; bovo, ox, bov'aĵ'o, beef.

'an'—denotes an inhabitant, partisan, member of:

Londono, London, London'an'o, a Londoner.
Kristo, Christ, Krist'an'o, a Christian.

'ar'—denotes a collection or reunion of certain things:

vorto, a word, vort'ar'o, a dictionary.
homo, a man, hom'ar'o, mankind.