The standard form categorical proposition of ‘Roses are fragrant‘ is 

The categorical proposition is an assertion that links two kinds of objects. 

Key Points

• A categorical assertion written in standard form always starts with the subject term.
• In a categorical proposition of standard form, the predicate term comes after the subject. 
• There are four standard forms of a categorical proposition: 
  • Universal affirmative, All S is P or Every S is P
  • Universal negative, No S is P
  • Particular affirmative, Some S is P
  • Particular negative, Some S is Not P
• The Categorical proposition of ‘Roses are fragrant is Universal All Roses are fragrant things.

Thus, the standard form categorical proposition of "Roses are fragrant" is All Roses are fragrant things. 

Additional Information