We will now learn a few adverbs that describe frequency.

niekada, niekados, niekuomet (never)
retai (rarely)
retkarčiais (occasionally)
kartais (sometimes)
dažnai (often)
visada, visados, visuomet (always)

Aš retai kalbu. I rarely speak.
Jis retkarčiais eina pasivaikščioti. He occasionally goes for a walk.
Vytautas kartais nekalba. Vytautas sometimes doesn't speak.
Milda dažnai eina pasivaikščioti. Milda often goes for a walk.
Mes visada einame kalbėti. We always go to talk.
Dovilė ir Dalia visada kalba. Dovilė ir Dalia are always talking.
Dariau ir Vytautai, jūs visuomet kalbate! Darius and Vytautas, you are always talking!

The three negative adverbs that start with nie (niekada, niekados, niekuomet) need the verb after them to have a negative from (negation prefix ne):

Aš niekada nekalbu. I never speak.
Ji niekados negyvena. She never lives.
Jis niekuomet neduoda man pinigų. He never gives me money.

Very often English speakers find this double negative illogical, as there is only one negative in English.