Affirmation, negation and imperative

1. Affirmation
         a) Without specific non-manual marking
         b) Affirmative headnod
         c) Affirmative signs
2. Negation
         a) Headshake
         b) Headshake and negative sign
                   b.1 Sentence negation
                   b.2 Signs incorporating negation
3. Imperative
         a) Basic form
         b) Alternative forms for command expression

This movement can be accompanied, although it is not compulsory, by other non-manual components indicating emphasis, such as furrowed eyebrows, slightly closing one's eyes, "sss", etc.

    "Today I've eaten absolutely nothing."
    "I understood nothing at all of what you just explained."