Eu sei que SIM,
I know they are,
Language note: 'Sim' in this context is an affirmative word, akin to saying 'yes'.
Word-by-Word Breakdown
Eu
[ee-oo]
I
Refers to the person speaking.
Eu estou cansado.
I am tired.
sei
[say]
know
To be aware of through observation or information.
Eu sei a resposta.
I know the answer.
que
[keh]
that
Used to introduce a clause.
Eu sei que você sabe.
I know that you know.
SIM
[seem]
yes
Used to give an affirmative response.
Sim, eu concordo.
Yes, I agree.
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