Various irregular verbs
The following verbs are more irregular than the others, and are each conjugated in their own way.
anna-, meaning give, is conjugated as a regular a-stem except in the past tense and past participle.
Anna becomes aun in the past tense, changing to one- before pronominal endings.
The past participle of anna is onen "given" (singular) and onin (plural)
note: the o of onin is not affected by an i-umlaut because it is derived from the dipthong au.
drava-, meaning hew, is conjugated as an a-stem except in the past tense, where it acts as an i-stem, becoming dramp, considered a poetic form of the regular dram.
gwedh-, meaning bind, is only irregular in the past tense, where it becomes gwenhant. A regular form, gwend, exists, but is considered poetic. It is speculated that the passive participle similarly changed from gwennen to gwendhannen.
thora-, meaning fence, is irregular in the past tense, the perfective active participle and the passive participle. The past tense is thaur "fencing", becoming thore- before the pronominal endings. The perfective active participle is thóriel "fencing". The passive participle is thoren "fencing" (singular) and thorin (plural)
trenar-, meaning recount, tell the end, is regular except for the past tense, passive participle and perfective active participle. The past tense is trenor "told". The perfective active participle is trenóriel "telling". The passive participle is trenoren "told" (singular) and trenorin (plural).
banga-, meaning trade, is a verb so irregular that there is no sure conjugation for it. There is banc, which could be either a form of the past tense (making banga- a mixed conjugation verb), or a noun meaning "trade". Both could be correct as well. To simplify matters, just treat banga- as a mixed conjugation verb, and banc as a noun.