I can not until you see and the kahn is kann
Nicht gesehen translates as 'Not seen' nicht= not sehen= to see and the 'ge' at the beginning means it is in the past tense.
nicht is not in english
sündigt nicht = don't sin
Spring' nicht (full springe nicht) means don't jump
"Ich möchte dich sehen" means "I would like to see you."
Ich will nicht translates as I don't want to.
"That is not" is "das ist nicht" in English.
"Will sie sehen wie ein Kind" without any context means "want to see her/them like a child."
sehen sie Dienstag = see them on Tuesday
I don't like you.
Don't go in the city.
"Nicht schnell, immer sehr leise" is "Not fast, always very quiet." in English.