1. 複合関係代名詞 whatever(=anything that)
    a. Whatever she wrote or drew in her life is preserved in this museum.
    b. She did whatever she could to protect the natural world she loved.
  2. 不定詞の意味上の主語
    a. It was a mistake for us to leave in this storm.
    b. This is a very good movie for children to see.
    c. The beautiful countryside was preserved for future generations to enjoy.
  3. 名詞の繰り返しを避けるthat[those]
    a. She was able to find a new role in life — that of a farmer.
    b. Winter in New York is colder than that in Tokyo.
    c. The rules of this sport are not very different from those of volleyball.