Well, lets start with infinitive.
'To be' = "Ser"
'To know' = "Conhecer/Saber"
Now, we know that 'know' comes from 'knowledge' and 'be' from 'being'. Adding 'to' before a noun makes it verb (infinitive form).
In portuguese, all the verbs in infinitive form end with "er". "Er" is the equivalent of 'to' in english, except that instead of putting behind the noun separated with a space, we actually put in the end of the noun.
(to easy understanding, nouns will be colored dark red and verbs turquoise)
'To be' = "Ser" ("Ser" in portuguese has 2 meanings: Ser = "Being"; Ser = "verb 'to be'! In this case, "ser" = "ser" + "er")
'To know' = "Conhecer/Saber" (know has 2 versions in portuguese: Conhecer (knowing someone personaly), and Saber (Saber comes from Sabedoria, which is the portuguese version of KNOWLEDGE)
As you should've got it by now, to make a verb its necessary a noun + the thing that makes it a verb ('to' in english, 'er' in portuguese). I'm missing the technical word for it right now (help me please :cheeky:)
I'm tired today, but keep asking me things about the languaje, as i can't remember everything. Keep suggesting things i should teach you.
Oh, if didn't understand anything of what i explained, please say, i'll try to explain it better.