15.56 In this type, at number 14, there are 14 students choose the wrong answer or

For the irregular forms, a noun with identical singular plural and is the highest percentage with the average 83, 33. The second level is irregular plurals from Latin and Greek 79, 52. The third level is irregular – e n plurals 66, 66. The fourth level is Umlaut plurals 63, 33. And the lowest level is noun with identical and plural singular 62, 22. From the interpretation data above, it can be summarized; many students made errors most in irregular forms than in regular forms with the average of percentage 71, 01 while in regular forms 31, 60. Here can be summarized that the factors of student’s error in learning irregular forms are there is no definite formula in forming irregular plural. So the way to know and master irregular plural forms is just by memorizing the words and does more the exercises. Meanwhile the causes of student’s error in learning regular form are they do not understand well about the rules that they learnt and make them confused to use it; they do not concentrate with teacher’s explaining. Their comprehension in learning plural form in Indonesia comprehends also can cause error in learning plural form in English rules. Both of them has own and different concept. Therefore the students must be able to distinguish between Indonesian structure and English structures in order avoid them from mistaken in changing singular into plural forms in English. The students also have to enrich their knowledge about plural by learning more and understanding well the rules. 49 CHAPTER IV CONCLUSION AND SUGGESTIONS

A. Conclusion

Based on the analysis and the interpretation of data in the previous chapter, the writer would like to conclude the whole total of percentage of error is 513, 09 with the average is 102, 61. Most of students made errors on the type of irregular forms, because the rule of irregular is more complicated. It errors occur when the students forgot the rules and cause them make error in testing irregular plural. It can also be seen on the average percentage for an irregular form is 71, 01. Most of the students chose the wrong answer in this type, while the average percentage for regular is only 31, 60. As the writer has said in the interpretation of data, the cause of student’s errors in irregular forms because there is no the exact rule to change singular forms become irregular plural, the students have to memorize the word and practice more. Meanwhile the factors of student’s errors in regular plural because they did not understand and forgot the rules and make them confused to change the word from singular into plural forms. The student also presumed that in forming plural, only add-s at the end of the word, but actually there are some exceptions. Errors also are caused by student’s comprehension which is still influenced by Indonesian pattern and translate the words literally. To reduce these errors the students have to learn and master more about the rule,