1. 模態(tài)邏輯命題的限制條件，建立在其內容的肯定或否定其可能性，不可能性，偶然性或必然性基礎之上
   The classification of propositions on the basis of whether they assert or deny the possibility, impossibility, contingency, or necessity of their content.
2. 換質法推導一個命題的方法
   Inference of the obverse of a proposition.
3. 逆命題通過換位得到的命題
   A proposition obtained by conversion.
4. 反對命題一種與另一命題相互聯(lián)系的命題，若后者為正確則前者一定是錯誤的，但若后者為錯誤的則前者不一定是正確的
   A proposition related to another in such a way that if the latter is true, the former must be false, but if the latter is false, the former is not necessarily true.

命的英語翻譯：

題的英語翻譯：