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Tap every inference that is actually valid

Exercise and reference answers

Questions
  1. Items
    1. Text
      'No S is P' gives 'No P is S'
      Matches the category
      Yes
    2. Text
      'Some S is P' gives 'Some P is S'
      Matches the category
      Yes
    3. Text
      'Some S is not P' gives 'Some P is not S'
      Matches the category
      No
    4. Text
      'All S is P' gives 'All P is S'
      Matches the category
      No
    Category
    A VALID conversion

Explanation

Reversing a statement is only sometimes allowed, and knowing which cases is the whole skill. Source: Logic: Deductive and Inductive, Carveth Read (1898), public domain.
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