The research follows the main line of dynamism and unfolds mainly in three subtasks: to construct speaker-assigned presupposition theory, to investigate relations between presupposition and common ground, and to solve the accommodation problem.

On the influnce of presupposition to intonation in oral commucati on;

The teaching goal is generated from the students rather than being preset by the teaching authority.

Stories may detailedly preset an end, and begin to relate at ease thereafter; they may also be structured by way of deduction from the characters sentiments so as to make natural and unrestrained reading.

Among many factors which influences the realization ofcurriculum reform targets in elementary education, presettarget quality is an important, whereas lack of attention andsystematic investigation variable.