The test is given to know the students‟ ability in distinguishing gerund from to infinitive after certain verbs in the sentences. The writer gave 20 items of
the test to the second grade students of SMA Islam Al- Kholidin. 2.
Interview To know students‟ understanding about gerund and to infinitive, the writer
gave 5 questions to second grade students of SMA Islam Al- Kholidin in doing the interview. The writer chose 9 students; they were 3 students who got the
highest score, 3 students who got middle score and 3 students who got the lowest score. The questions were only given to nine students, and it was hopefully to
know the causes of errors that students made in using gerund and to infinitive.
F. The Technique of Data Analysis
After collecting the data from the test, the researcher analyzes the students‟ errors by focusing on their errors in using gerund and to infinitive from
the students‟ answer sheets. The researcher analyzed it by marking the errors and
counting the errors i nto percentage, to calculate the percentage of students‟ errors,
the researcher uses the formula below:
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P= x 100
P = Percentage F = Frequency of error made
N = Total of students‟ errors
G. Checking of Data Validity
The researcher verified data test instrument by using SPSS Program, and interview by using triangulation data based on theories of the research. Here, the
researcher compared the research findings of interview with the theories that used in chapter two. The theories in this research focused on types of error and causes
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Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: PT. Raja Grafindo Persada, 2001, p.40.
of error in error analysis theory. From some theories above the writer uses Brown‟s theory in dividing cause of errors made by the students. There are four
causes; interlingual transfer, intralingual transfer, and context of learning. Based on the research findings of the research, the data is valid because
there is mutual meaning between data interpretation of interview and theories. It can be proved that the respondents make errors in using gerund and infinitive
because of Interlingual Transfer.
