Ivrinel: Avon meno od i had hen...
Amdiron: Avo no dem. Dadwenathogir na Imladris, a ledhathon na Eryn Lasgalen ned lû thent
Siron: I 'wend vîn breniatha anuir

Ivrinel: I don't want to go from this place...
Amdiron: Don't be sad. You will all return to Rivendell, and I will travel to the Wood of Greenleaves in a short time
Siron: Our friendship will endure forever

û/ú- = no, not, impossible to do

Important note: ú- causes soft mutation on whatever follows it or is attached to it. . Whether you use soft mutation on the word following the standalone word û is entirely down to your preference as we have no evidence suggesting it should be one way or the other.

The word û means both 'no' or 'not' by itself.
Lilthathol? û = Do you want to dance? No.
Te û nórui sír = It is not sunny today.

The prefix form of û is ú-. When ú- is attached to a noun adjective or adverb it gives the opposite meaning of a word:
Nad = Something, but únad = Nothing
Beren = Bold, brave, úveren = Cowardly
Land = Wide, but úland = Not wide, narrow

Please note the difference between û + word, e.g. Te û vrui = It is not noisy, and attaching it to a word which gives you the negated form; Te ú-vrui = It is quiet

Attached to a verb, ú- gives the meaning of ‘impossible to do’, i.e. 'cannot, could not', or 'will not' depending on the tense, for example:
Han ú-chedin = I cannot throw that
Den ú-vreniannen = I couldn’t endure it
Gin ú-genathon = I will not see you

Ava- = to refuse, don't

In imperative sentences only, the verb that follows Ava- is mutated with soft mutation.

The verb Ava- which means 'to refuse to do something' is usually followed by a second verb, much like auxiliary verbs in English.
When issuing a command it can be used as either the separate word Avo or as the prefix Av- that attaches to the following verb. In all other cases the second verb takes the infinitive/gerund form and doesn't require mutation.

Attested example:
Avgaro! or Avo garo! Don’t do it! (Car- = to do)

Further imperative examples:
Avdolo! or Avo dolo! = Don't come! (Tol- = to come)
Avdhadweno! or Avo dhadweno! = Don't return! (Dadwen- = to return)
Avdhefo! or Avo dhefo! = Don't try! (Def- = to try)

Avo or Av-? Please click here for further information.

The only surviving forms of the verb Ava- are listed below.

Present tense

Singular	Meaning	Plural	Meaning
Avon	I won't, I refuse	Avam	We won't, we refuse
Avad	Refusal (noun)	.	.

Follow Avon or Avam with the infinitive/gerund form of a second verb, for example:
Avon maded i aes han! = I refuse to eat that meat, I won't eat that meat!
Avon den cared = I refuse to do it, I won't do it. (remember your object pronoun needs to go before the second verb)
Avon teithad angin = I won't write to you
Avam padrad ennas = We won't walk there
Avam linnad hír = We won't sing today
Avam toled na Imladris = We won't come to Rivendell

Pen- = to lack

Important note: Pen- (as both a prefix and a verb) causes soft mutation on the word that follows

As a prefix, Pen- means 'less, without', for example Pen-adar = Fatherless, or Pen-'ell = Joyless. When attached to a noun like this it refers to a complete impossibility.

As a verb, Pen- means 'to lack', and is used in Sindarin to say 'have not'.
From the attested example Penim vast = We have no bread (we lack bread), we know that the object follows the verb and mutates with soft mutation.

Examples:
Penin vann = I have no food, I lack food
Pên vellyn = He has no friends, He lacks friends
Penir nen = They have no water, They lack water
Pennin chervess = I had no wife, I lacked a wife
Penn degil = She had no pen, She lacked a pen
Pennir vegyl = They had no swords, They lacked swords

Do not/Did not?

With the changes to ú- and the restrictive usage of Ava- how do we translate sentences like 'You don't want to go', 'He doesn't like it', 'She doesn't eat meat' or 'They didn't kill the orcs'?

Questions: Change the verb (or just use û)
Onureg na Vree? Did you run/ride to Bree? û, padrannen = No, I walked
Den gant? Did he catch it? û, dannant = No, it fell

Wanting to do something: Use Pen- and the infinitive of Aníra-
 I don't want to go = Penin anírad mened (I lack desire to go)
He doesn't want fish = Pên anírad an lim (He lacks desire for fish)
They don't want to fight = Penir anírad maethad (They lack desire to fight)
We didn't want to see it = Pennim anírad den cened (We lacked desire to see it)
She didn't want to trade to him = Penn anírad bangad anden (She lacked desire to trade to him)

X don't/doesn't/didn't Y: 'X is not a doer of Y'
I don't eat meat = Ni û vador aes (I am not an eater of meat) [vador would be mador if you don't want to use soft mutation]
They didn't kill the orcs = Ti û negnir yrch (They are not slayers of orcs) [negnir would be degnir]
You don't like roses = Le û velor meril (You are not a lover of roses) [please note that this doesn't have the same double meaning as 'lover' in English as Sindarin has separate words for those such as Melethor]

The agental or 'doer' suffix is -or. You can add this to the end of any verb stem, just remember to take off the final A of A-stem verbs. For example:
Teitha- 'to write', Teithor = Writer
Mib- 'to kiss', Mibor = Kisser