The so-called weak verbs are Graul's classes I and III, which have tense markers ˱ r for the present, ɨ in for the past, and  v for the future. The in past may be phonetically [ '025 n] or [ '124 n]. (Graul's Class II has the same tense markers in the present and future, but in the past, the marker is ÿ¢ (in LT) and ÿ¢ nt and þ« nj in spoken. )
The verb ׶ԧè sollu is exceptional in that the § l
assimilates in the past to ¨¨ nn: ׶ԧÁÕØƨ 
׶ԨØƨ sonneen. The verbs ×´Ôýà¤Ø½Ô kondupoo
`take (something) and î¥Ü´Õ¥à¤Ø½Ô kuuttikittupoo
`take (someone)' are conjugated exactly like Ø½Ô poo `go'. They
have a different past neuter form (cf. § xxx) Ø½Ô«ß pooccu
instead of the expected *ؽÔÆâ * poonadu. ÈÞ aahu is also
similar, with past neuter È«ß aaccu. Note also that neuter future
forms are different for all verbs: they are formed by adding ˣ
um to the infinitive (after deleting the Ç a.)