I'm seeing verbs presented in written materials in groups of fours such as:

geta, gat, gátum, getað (To be able, I was able, We were able, It has been able)

sitja, sat, sátum, setið (To sit, I sat, We sat, It was sitting)

From what I can pull back from primary school days, it appears the pattern is:

- infinitive,

- past tense (1st person singular)

- past tense (1st person plural)

- (and I think...) past perfect (3rd person)

Is this correct (or close)? Is this a standard pattern presented in language classes? Do most language dictionaries have this pattern? Are these four used most often in language?