Aphasia is an acquired language disorder which affects all the components of the language. Comprehension of the sentences in which the word order varies from the usual is extremely difficult to people with aphasia (Dronkers, Wilkins, Van Valin, Redfern & Jaeger, 2004). It is still unclear whether the difficulties connected to sentence comprehension come from variations in separate processes of distribution and interpretation of the sentences or people with aphasia have limited ability to perform multiple operations. However, it is certain that this research needs more attention. Main question that this thesis deals with is to which degree can morphological keys affect the performance of people with aphasia in tasks of sentence comprehension. In the research there were 10 subjects with aphasia and 30 subjects with regular language status who were questioned using the method of eye tracking. The subjects listened to the sentences which differed in word order (subject-verb-object and object-verb-subject) and in the presence of the morphological key (verb extension for perfekt which is in agreement with the subject in its number and gender). The results showed statistically significant differences in the average number of the fixations between the subjects with aphasia and subjects with regular language status which gives us better understanding of the language processing in people with aphasia. The research showed that there is not statistically significant difference in language processing of the sentences where morphological key is present which leads to conclusion that the subjects do not rely on morphology when interpreting a sentence. A detailed result analysis and observation during the research show that people with aphasia delay the decision of the object and subject division in a sentence and later they look at the target photograph which shows that they are not able to anticipate the meaning of the sentence before its ending and that the morphological keys of a sentence do not help in doing so. In total, the results show slower, but also different language processing when comparing people with aphasia to people with regular language status. This thesis contributes understanding aphasia in languages with rich morphology, but at the same time it points out many unanswered questions about what people with aphasia need in order to understand sentence.