文の書きかえ
  A day has twenty-four hours.
  There are twenty-four hours in a day.

       　　１日は２４時間あります。
  A week has seven days.
  There are  seven days in a week.

       　　１週間は７日あります。
  How many days does February have?
  How many days are there in February?

           ２月は何日ありますか。