Hello!
Shakespeare's plays are often considered difficult for modern students to understand because of the language used. Shakespeare's plays are written in a very old and formal version of English. Today, English is much less formal and more slang is used. The difference in the way that the English is written in the plays make it difficult for today's students to understand.
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Good modifies phone and is a predicate adjective, so a.
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C) It modifies the word "letter"