In Toaq, negation is expressed with bu, which can come before tenses, aspects, or verbs.
Scope
The scope interactions with quantifiers can be surprising. Remember that quantifiers "float up" to the top of the clause, above bu.
If we want to say "not all those who wander are lost", we might accidentally say:
Bu tıeqbıao tú neqkoı.
= Tú neqkoı nä, bu tıeqbıao néqkoı.
Each wanderer is non-lost. 😱
To get the right meaning, we have to instead say
Bu tıeqbıao sá neqkoı.
Some wanderers are non-lost.
Sahu, ꝡä tıeqbıao tú neqkoı.
It's false that each wanderer is lost.
Here is how bu interacts with quantifiers and tenses:
Mala bu chuq tú raı báq nam.
For each X: X has ever not-eaten bread.
Bu mala chuq tú raı báq nam.
For each X: X hasn't ever eaten bread.