ich weiss gar nicht was ich schreiben soll = I have no idea what I should write
Weiss nicht translates as don't know.
Weiss ich nicht translates as I don't know.
"if" or "whether"Ex: Ich weiss nicht, ob ich kann. I don't know if/whether I can.
nicht is not in english
sündigt nicht = don't sin
Spring' nicht (full springe nicht) means don't jump
Ich will nicht translates as I don't want to.
"That is not" is "das ist nicht" in English.
Weiss (or weiß) is the German translation of the English word "white", or a form of the verb "to know".
Don't go in the city.
I don't like you.
"Nicht schnell, immer sehr leise" is "Not fast, always very quiet." in English.