我們學校的作業是採取上傳網路的方式                                              老師將作業截止時間訂為23:59分                                                   我在23:20分繳交作業                                                             但是我的學期總平均卻是45分                                                      我寄信去問                                                                      他說                                                                            他在23:15分就已經將所有作業下載                                                 所以沒有收到我的作業                                                            將我的期末作業訂為缺交0分                                                       他於之後又再確認一次                                                            發現我的確有交作業                                                              並在我提出疑問的時候把作業截止時間改為23:00分                                   然後再寄一封信告訴我                                                            我的作業遲交 所以0分                                                            "試圖製造出我遲交作業的假象"                                                    請問此舉是否構成"偽造文書"呢?