Videre possum puellae
Facturus est hodie forum
Volo ut lego librum
Vis recte respondere quaestioni
We do not walk in schola
Fera canes ululat
Et stabit in stadio
I think it is the a speaker's <span>behavior</span> knowledge both of the grammatical rules of a language and of the rules for appropriate use in social contexts
Hope i helped you