The story of Frankenstein chapter 4&5

1- What realization does Victor have in Chapter 4? What 3 reasons does Victor give for not sharing his realization with his family?

  Victor realized that the monster he created killed his brother, William. He came to Geneva because his father wrote a letter that William was murdered. However, it was too late that the gate of the Geneva was closed. So, he decided to visit the place where his brother was founded. And there, he saw a figure of a gigantic stature in the gloom. Because of this, Victor thinks that William was murdered by his creature. After realizing that, he decided to tell his family everything that he made the murderer. However, he paused and thought about what they might think about him. Himself, who brought a life to the creature and met it in the midnight of the forbidding mountain. They would also think that Victor is a madman. And, it is hard to capture the monster that can climb the steep sides of the mountain.   

2- In Chapter 4, Clerval wants to study Oriental Languages. Which languages would he most likely have studied, and what purpose do you think he would use them for?

  He wanted to study Ingolstadt language. In this story, Clerval proposed Victor to go a walking tour around Ingolstadt with him.

3- In chapter 5, page 36, Victor says: "Sometimes, with my sails set. . . . let loose among them?" Paraphrase this passage, and why does Victor choose to not follow this course of action?
  Sometimes, with my sails set, I was carried by the wind; and sometimes, after rowing into the middle of the lake, I left the boat to go its own way. I was often tempted, when all was at peace around me, to plunge in to the silent lake, which the waters might close over me forever. This means that he planned to commit suicide by throwing his body into the lake. The reason is because he regret of making the creature that killed his brother. And he felt guilty of himself to other family members not telling the truth of what he knew. But I held back when I thought of the heroic and suffering Elizabeth, whom I tenderly loved, and whose life was bound up with mine. I thought also of my father and surviving brother; should I, by departing this world, leave them exposed and unprotected to the violence of the fiend whom I had let loose among them? In this part, Victor thought about his lover, Elizabeth and his family that are very dangerous because of him. The creature might kill them suddenly like William. Also, they might be unhappy and feel sadness. So, Victor gave up to committing suicide.