Basic components

1. Introduction
2. Manual components
         a) Configuration
         b) Place
                  b.1) Neutral space
                  b.2) Around the head
                  b.3) In contact with the body
         c) Movement
         d) Orientation
3. Non-manual components
         a) Facial expression
         b) Torso movement
         c) Head position and/or movement
         d) Mouth gesture
                   d.1) Imitative
                   d.2) Compulsory component
                   d.3) Optional component
                          (modifier)
         e) Mouthing
                  

And in the third place we have those mouth components contributing information about the verbs, adjectives or adverbs they go with. They are not a compulsory part of the sign but rather appear or not according to the information that the signer wants to convey. For instance, "very fast", "easily", "unwillingly", etc.

    "To walk easily"
    "To walk fast"

When accompanying the adjective, mouth components define its degree, such as a little, a lot, etc.

    "Quite clean"
    "Very clean"

And when accompanying an adverb, they are also in charge of modifying its degree. For example, a little, a lot, etc.

    "Slowly"
    "Very slowly"