Abstract
The aim of this research to explain the assentional scientific subjects which Sibawaih emphisise from it to built the grammatical base of according to the hypothical imagination depen upon several scenarios, which are: The hypotheses which are depending on presumptions of heavy use, advance and delays, speaker saying, removal of uncertainty from speaker, removal of uncertainty from speaker thought, question and answer for it, prior, knowledge acute remembering, mental interpretation, measurement.
On my opinion this research componsasly to studing the Sibawaih vision on grammarian learn, at last or a part of it, thereby to seal the most important research results
