The time signature 9/8 can be grouped in various ways depending on the musical context and feel. It typically has nine eighth notes per measure, and common groupings include:
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Three groups of three (• • •): This gives a flowing, compound feel, often associated with a "lilt" or a dance-like rhythm. Each group of three could be thought of as a dotted quarter note.
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One group of three and two groups of three (• • • | • • •): This is still a compound feel but creates a slight emphasis on the first group.
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Groups of two and one group of five (• • | • • | • • •): This less common grouping can create a unique rhythmic pattern.
Ultimately, the specific grouping can vary based on the genre and the composer's intent.