She spoke quicker than he did. She spoke more quickly than he did. Can you enlighten this?
Because "quick" is an adjective (not an adverb), the correct sentence would be "She spoke more quickly than he did."
This is how "quicker" can be used correctly: "My sports car is quicker than your minivan."
This is how "quicker" can be used correctly: "My sports car is quicker than your minivan."