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

Total 158,03 Average 31,60 2 Irregular forms a. Noun with identical plural and singular b. Noun with identical singular and plural c. Irregular –e n plural d. Umlaut plurals e. Irregular plurals from Latin and Greek 62,22 66,66 83,33 63,33 79,52 Total 355,06 Average 71,01 The whole total 513,09 The whole average 102,61 Based on the table above, it can be seen that on the regular forms, the highest percentage of errors is on type of nouns ending in –y with the average 38, 88. The second level is ending with sounds of ss,x, sh, or ch with the average 36, 66 . The third level is nouns ending in –f or –fe with the average 35, 55. The fourth level is noun ending in –o with the average 31, 11. And the lowest percentage is on type the majority of plural nouns with the average 15, 83. It is because regular plural forms have the exact rule and more easy to understand 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.