A semantic representation of a sentence is a complex concept formed by repeated integration of the adjunct schema into the head schema. We proposed a model of sentence comprehension with checking of consistency between the adjunct schema and the requirement for the integration of it into a slot of the head schema. If the requirement is not satisfied, selectional-restriction of the slot is extended in order to be coherent with comprehender's world knowledge, and then the consistency is checked again. This model can explain the difference of the processes between the typical combination and the atypical one. The validity of this model was discussed.