Reason 1: I have been fully prepared for a long time, and all the design materials are ready. I have completely completed the requirements of my graduation project (thesis) in the first draft, the second draft, the third draft and the call for papers.

Reason 2: This paper extensively searches, sorts out and systematically summarizes a large number of accurate and reliable language materials about the asymmetry of English verbs' active voice and passive voice, and on this basis, it makes a rigorous scientific analysis and theoretical exploration in combination with relevant linguistic theories.

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Graduation thesis defense is an important form of organized, prepared, planned and evaluated papers. In order to do a good job in the defense of graduation thesis, the school, the defense Committee and the respondent (the author who wrote the graduation thesis) should make full preparations before the defense meeting.

After the graduation thesis defense, the defense committee shall evaluate the thesis performance according to the graduation thesis and the author's defense. In order to make the grading moderately balanced, schools should formulate grading principles or standards in advance.

Graduation thesis scores are generally divided into five grades: excellent (90- 100), good (80-89), medium (70-79), passing (60-69) and failing (below 60).

The Correspondence College of the Central Party School adopts a four-level scoring system, namely excellent (equivalent to 90- 100), good (equivalent to 75-89), passing (equivalent to 60-74) and failing (below 60).

After the students answered all the questions one by one, they left. According to the quality of the paper and the defense situation, the defense Committee collectively decides whether to pass or not, and draws up scores and comments.