1. The three witches in the beginning
2. Macbeth starts having visions of seeing a dagger after killing duncan
3. He sees the ghost of Banquo after killing him too
Can you put a picture up of the passage to better help you ?
Noun clauses are dependent clauses and can serve the role of the subject in a sentence. In this cause, the noun clause is "whomever wins the Spirit Award". The person winning the spirit award is doing an action, so they are the subject of the sentence.