Theory A of sentence memory predicts that with Sentence Structure I the word frequency of the adjective in a sentence will influence comprehension time,whereas with Sentence Structure II it will not. Theory B predicts that the effect of the word frequency of the adjective will have the same effect for the two sentence structures. Twelve participants were presented with 10 examples of each sentence structure type, five containing high frequency adjectives and five containing low frequency adjectives.The time taken by each participant to understand each sentence was recorded and a mean time computed for each participant in each condition.