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nolds tested the meaning acquisition of tenses again and they found that English learners’ acquisition  of  tense are  easier  with the  help  of the lexical aspect of  verbs.  At the same time, they  found  that  the  process  of  the  second  language  acquisition  was  almost  the  same  as  the acquisition  process  of  the  first  language  tenses.  Besides,  they  also  figured  out  that  in  the lexical aspect hypothesis necessary context played a n important role. 
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3. Methodology .....15 
3.1 Research Questions ........ 15 
3.2 Subjects ........... 15 3.3 Instruments ...... 16 
3.4 Procedures ....... 17 
4. Results and Discussion .....19 
4.1 Descriptive Statistics of the Questionnaire ........... 19 
4.2 PPT Attrition of Junior High Schools Students .... 22 
4.2.1 Descriptive Statistics of the test scores in the First and Second Tests ..... 22 
4.2.2 T-test of English PPT Performance in the First and Second Tests ........... 23 
4.2.3 Evidence of PPT Attrition of Junior High School Students ..... 24 
4.3 The Effect of Initial Acquisition level on PPT Attrition ...... 24
4.3.1 Subjects Grouping ....... 24 
4.3.2 Language Proficiency in the First and Second Test .......... 24 
4.3.3 English PPT Attrition of the three Groups......... 25 
4.3.4 The Relationship of Initial Acquisition level and PPT Attrition ...... 27 
4.4 The Features of PPT attrition ......... 28
5. Conclusions ...... 38
5.1 Major Findings........ 39 
5.2 Implications .... 39 
5.4 Suggestions for Future Research ........... 41 

4. Results and Discussion 

The  results  were  presented  in  this  part.  As  the  focus  of  this  study  is  the  change  of  the tests’  scores  over  time,  the  scores  of  the  two  tests  about  English  present  perfect  tense  were described  in  this  chapter.  Then  statistical  analyses  and  various  descriptive  forms  are  used  to compare and explain the score results. 

4.1 Descriptive Statistics of the Questionnaire 
Tense The  questionnaire  aims  to  find  out  participants’  knowledge  awareness  and understanding  of  present  perfect tense.  And it  has 7  questions  from question 1 to question 7. The following describes is the collected data of 45 students who have completed both the first and second tests. Question 1 is about the mastery of present perfect tense. The number of the participants who  choose  A  is  only  2,  which  account  for  4.44%.  The  percentage  of  the  participants  who choose  B  is  8.88%.  More  than  half  of  the  participants  think  that  their  mas本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。