1. 一般子句
   1. 如果
   2. WH
   3. So Too
2. 完成式
   1. Have you
   2. Has he
3. 關係子句
   1. 主詞
      1. I know
         1. the girl
         2. the girls
      2. I like
         1. the cat
         2. the cats
      3. who/that
      4. which/that
   2. 副詞
      1. I met the woman
         1. who/that
      2. We like the song
         1. which/that
4. 語態
   1. 附加問句
      1. Blue whales are big
         1. aren't they
      2. The girl isn't your sister
         1. is she?
   2. 分詞
      1. The game
         1. is
            1. interesting
            2. exciting
            3. boring
            4. surprising
         2. to the
   3. 被動語態
      1. Math
         1. is
            1. taught
            2. at every high school.
      2. Paper umbrellas
         1. aren't
            1. used
            2. today.
      3. The butterfly
         1. was
            1. caught
            2. by a student.
      4. The ants
         1. weren't
            1. killed
            2. by patty.
5. ever
   1. been to Meinong ?
   2. Spoken to the actor ?