Word: begannest
Part of speech: Verb
Syllables: be
ga
nnest
Definition: Alternative form of begin; begin to speak or say;  he began
Morphemes:
Affix: began
Language: en
PoS: Verb
Meaning: Alternative form of begin; begin to speak or say;  he began
Affix: -est
Language: en
PoS: Suffix
Meaning: Used to form the second-person singular present tense and past tense of verbs. (if thou is the subject; not used with you)