De, from, since, of (in quantities):
unu de li, one of them.
de-pos, since, after.
di, of (possession and genitive).
da, by (authorship or after passive verb).
a, ad, to (direction, object, intention):
pensar a, to turn one's thoughts to, think of.
amo a Deo, love of God.
irar a..., to go to -
aden, into.
adsur, on to.
en, in.
ek, out of (with motion, choice, material).
vazo ek oro, a vase of gold.
irar ek la chambro, to go out of the room.
exter, outside (without motion).
sur, on.
super, above.
sub, under (with or without motion).
infre di, at the bottom or foot of, below.
inter, between, among.
tra, through (in crossing only).
cis, this side of.
trans, the other side of, across (with or without motion).
preter, beyond, leaving behind.
lor, at the time of.
ante, before (in time).
pos, after (in time).
avan, in front of, before (in space).
dop, behind, after (in space).
koram, in the presence of.
che, at, to (the house).
apud, next to, by, beside.
an, on, at (contiguity):
an la tablo, at table.
an Seine, on the Seine.
cirkum, around, about (place, time, quantity, etc.)
kontre, against.
pro, because, on account of.
por, for, in view of, in order to.
per, by means of, through.
pri, concerning, of, about, relating to, on.
kun, with (in company with).
sen, without (privation).
ultre, beyond, in addition to.
proxim, near, close to (not touching).
po, for, at the price of, in exchange for.
dum, during.
til, till (prep.) as far as.
til la pordo, as far as the door.
malgre, in spite of, notwithstanding.
vice, instead of, in the place of.
segun, according to.
alonge, along.
vers, towards.
ye, at (indefinite preposition).

Prepositions must always be placed before a noun or pronoun:
This is the book he spoke of (= of which he spoke),
Yen la libro, pri qua il parolis.
What are you talking about (= about what ...)?
Pri quo vu parolis?

It is frequently possible to combine a final preposition with its verb, or to form a phrase:
This is the stick he came with (= which he brought),
Yen la bastono, quan il ad-portis.
The doctor was sent for (= one caused-to-be-fetched),
On quer-ig-is la mediko.
The bag he came for (= which he fetched),
La sako, quan il queris.
This will do to go on with (= at the beginning),
Ico konvenos en la komenco.
The boat had not been intended to be lived in,
La batelo ne esis destinita por habitado.
The church had not been preached on for many years,
On ne predikabis en la kirko dum multa yari.

A word which is a preposition, if before a noun or pronoun, may be an adverb, if alone:
Near the brook, Proxim la rivereto.
The brook ran near, La rivereto fluis proxime.

All Ido prepositions can be changed into adverbs by the addition of an -e:
dum, during; dume, meanwhile.
lor, at the time of; lore, then.
pos, after; pose, afterwards.
ante, before; antee, previously.
kontre, against; kontree, on the other hand, contrariwise.

As adjectives, antea means previous, posa, subsequent, kontrea, opposing.
(Extere, interne, are used in place of ene, eke.)

Some prepositions are used as adverbs in English with a different sense:
About an hour, Cirkum un horo.
They ran about, Li kuris hike ed ibe.
On the bell, Sur la klosho.
They rang on, Li sonigadis.
Over the way, Trans la voyo,
The storm was over, La sturmo esis finita (o: esabis).
Up a tree, Supre di arboro.
The door is shut up, La pordo esas tote klozita.
Turn round the horse, Turnez cirkum la kavalo.
Turn the horse round, Turnez la kavalo.

Prepositions in English, are often used with the full meaning of a verb, the verb accompanying them having only the value of an adverb:
To walk in, ride in, creep in, run in, float in (= to enter by walking, riding, creeping, running, floating),
En-irar marchante, vehante, reptante, kurante, flotacante.
I wind about and in and out,
Me sinuifas, en-iras, ek-iras.
He was trudging through the woods, up hill and down dale.
Il pene tra-iris boski, acensis kolini, decensis vali.
It was blown off into the dirt.
Ol esis de-portata da la vento aden la fango.

The consequence of this peculiar use is that an intransitive verb can (apparently) take a direct object:
Will you row me to the bridge?
Ka vu voluntas rem-vehigar me a la ponto?
The child will cry her eyes out,
La infantino ruinos sua okuli per lakrimi.
Kiss away her tears,
Sikigez elua lakrimi per kiso.
He was argued into allowing the fact,
Il esis obligata per argumenti aceptar la fakto.

Adjectives are also used in the same way:
They walked themselves dry,
Li per marcho sikigis su.

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