Much of the fear addressed in "The Fall of the House of Usher" is related to decay and death. As the narrator arrives, he contrasts the long-standing, enduring trees with the decayed aspect of the house. Usher appears extremely pale, and the impending death of Madeline dominates the atmosphere in the house and has caused Roderick to lose his mind. The cataleptic condition of Madeline also brings with it repeated death-like experiences, and the fear of a premature burial, another of Poe's topics.
You can follow this trend of thought and illustrate it with those elements and passages in the story that relate to this decay, with its accompanying gloom, and with all those that refer to death and to untimely entombment.
Young Mary Lennox is orphaned by an earthquake in India and sent to England to live with her uncle in a cold ancestral manor in Yorkshire. Mary briefly meets him, still mourning for his wife who died ten years ago, but she is mostly left on her own. A resourceful and inquisitive girl, she soon makes two exciting discoveries. First she finds an overgrown secret garden, the favorite of her aunt and locked up since her death. Second, that she has a cousin, Colin, a sickly boy who has been told he must remain in bed out of the daylight at all times. Once Mary and another new friend, Dickon, have brought the garden back to life they decide Colin must see it, a decision that will change several lives.
Answer:
Learn to listen
Pay attention to body language
Observe how others communicate in different contexts
Don't be afraid of a bit of silence
Use action verbs and confident language
Ask questions
Find common ground, even in an argument.
