non sei

I don't know

se

• Conj

  if

• Pron

van

• Adj

  1. empty, devoid of content, containing only air
  2. useless, ineffective
  3. vacuous, trivial-minded

• Noun
• Verb

tamén

1. either; including
2. also, too, as well
3. even

vostedes

you

non

1. no, not, not at all
2. no (used to show disagreement or negation)
3. no (used to reinforce an affirmation as negation of the alternative - but it can be omitted without changing the meaning)
4. no (reinforces a mandate in interrogative sentences)

sei

first-person singular present indicative of saber