according to Quality
Affirmative
Negative
Simple and Complex Propositions.
§ 207. A Simple Proposition is one in which a predicate is directly affirmed or denied of a subject, e.g. 'Rain is falling.'
§ 208. A simple proposition is otherwise known as Categorical.
§ 209. A Complex Proposition is one in which a statement is made subject to some condition, e.g. 'If the wind drops, rain will fall.'
§ 210. Hence the complex proposition is also known as Conditional.
§ 211. Every complex proposition consists of two parts—
(1) Antecedent;
(2) Consequent.
§ 212. The Antecedent is the condition on which another statement is made to depend. It precedes the other in the order of thought, but may either precede or follow it in the order of language. Thus we may say indifferently—'If the wind drops, we shall have rain' or 'We shall have rain, if the wind drops.'