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

The second mechanism involves the use of a headnod movement, which must be done when the sentence is the answer to a question or upon emphasizing or establishing a contrast.

"Do you have brothers and sisters? Yes, I have three."
"There was a white monkey in the zoo."
"Not coffee, thank you. Tea, yes, I'll have."