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be (EN)
助動詞、動詞

助動詞 “be”

不定詞 be; 私 am, 'm; あなた are, 're; 彼 is, 's; 過去形 were / was; 過去分詞 been; 動名詞 being
negative: he isn't, past wasn't; you aren't, past weren't
  1. 動詞の過去分詞と共に使われ、受動態を作るために用いられる
    The cake was eaten by the children. Another one will be baked by their mom tomorrow.
  2. 動詞の現在分詞と共に用いられ、進行形を作るために使われる
    She is running a marathon this weekend. She was preparing for it yesterday.
  3. 義務や意図を表す正式な方法
    You are to complete your homework before playing video games.

動詞 “be”

不定詞 be; 私 am'm; あなた are're; 彼 is's; 過去形 were / was; 過去分詞 been; 動名詞 being
否定: 彼「to be」isn't, 過去形wasn't; 君「to be」aren't, 過去形weren't
  1. である(主語と名詞を結びつける)
    She is a doctor. The animal is a cat.
  2. である(主語と属性を結びつける)
    The cat is fluffy. This was quite strange. Helping others is as important as taking care of yourself.
  3. 存在しているか、ある
    There is a chance of rain this afternoon.
  4. 〜歳である
    My sister is 15 years old.
  5. 〜時である
    It is 10:30 in the morning.
  6. 〜からである
    It has been five minutes since the last call.
  7. です(天気を表す時に使います)
    It is very windy today.
  8. 〜にある
    The keys are in the drawer.
  9. いつですか(「be」を使った質問文で、イベントのタイミングを尋ねる際に使う)
    When will the concert be?