сякнуть - imperfective verb
Present
singular
plural
1-e
2-e
3-e
сякну
сякнешь
сякнет
сякнем
сякнете
сякнут
Past
singular
сякнул сякнула сякнуло
plural
сякнули
Infinitive
сякнуть
Imperative
сякни
сякните