How are negative imperatives constructed?
Subject prefix + si + verb stem + e
The "-e" ending is only for Bantu verbs (those usually ending with -a), the others keep their last vowel. Monosyllabic verbs lose the 'ku-'
Usiruke - don't jump
Msifikiri - don't think (plural)
Asante! That's going on my cheat-sheet right away.
I tried to look up what's this subject prefix. In this context it makes the command more polite. u- is singular, m- is plural form as far as I understood.
should "you do not sleep" be accepted?
No, since this is a command not a statement
"YOU do NOT sleep!" sounds pretty much like a strong negative command. Therefore it should be accepted!
'you do not sleep' is a statement of fact, not a command