conclusive: applies to reasoning or logical proof that puts an end to debate or questioning: ~ evidence of criminal guilt.  （逻辑logic是基础词，有3个属性，1有顺序orderly 2清晰clear 3无谬误freedom from error，如she has a logical mind她逻辑思维很强。 推理reason就是指逻辑思考implies logical thinking，如reasoned they must know each other推断他们肯定互相认识）
  
  
decisive: may apply to something that ends a controversy, a contest, or any uncertainty: the ~ battle of the war.      contest比赛
  
  
determinative: adds an implication of giving a fixed character, course, or direction: the ~ influence in her life.
  
  
definitive: applies to what is put forth as final and permanent: the ~ biography of Jefferson.   （final最后一个，permanent一直存在，永久的，如UNSC permanent members安理会常任理事国）  
  
  
conclusive决定性: 指通过逻辑推理证明，使争论探寻得以结束(question提问是一种探寻)，decisive决定性: 指结束争议竞争和不确定性，determinative决定性: 还表示确定了属性道路方向，definitive终极: 表示作为最终永久的
  
  
记忆方法： 1）首字母DDDC大大的错<==决定性后果
 
           2）决定性的意思是使结束mean bringing to an end.