Introduction:
Kezia is a young girl in the short story "The Doll's House" by Katherine Mansfield. She is depicted as being afraid of her father, and this fear is evident in her trembling and shuddering in his presence.

Reasons for Kezia's Fear:
1. Authoritarian Nature: Kezia's father is portrayed as a strict and authoritarian figure. He expects obedience and compliance from his family members, and any deviation from his expectations is met with disapproval and punishment. This authoritarian nature instills fear in Kezia, as she is constantly worried about displeasing her father.

2. Power Imbalance: Kezia is aware of the power imbalance between her father and herself. As a child, she is dependent on her father for her well-being and security. This dependency creates a sense of vulnerability, making her more susceptible to fear in his presence.

3. Lack of Emotional Connection: Kezia's father is depicted as emotionally distant and unapproachable. He rarely shows affection or engages in meaningful conversations with his children. This lack of emotional connection contributes to Kezia's fear, as she feels a sense of alienation and detachment from her father.

Kezia's Physical Reactions:
1. Trembling: Kezia's trembling in her father's presence is a physical manifestation of her fear. It reflects her heightened anxiety and nervousness. The fear she experiences can be overwhelming, causing her body to involuntarily tremble as a response to the perceived threat.

2. Shuddering: Shuddering is another physical reaction exhibited by Kezia in her father's presence. It signifies her instinctive recoil or involuntary movement caused by fear. This reaction is a result of the psychological and emotional distress she experiences when confronted with her father's intimidating presence.

Conclusion:
Kezia's fear of her father stems from his authoritarian nature, power imbalance, and lack of emotional connection. Her trembling and shuddering in his presence represent the physical manifestations of her fear. This fear has a significant impact on Kezia's emotional well-being and shapes her perception of her father as a figure to be feared rather than trusted and loved.