1.

   (1)   It be + 形容詞 + for + 人 + to V
   (2)   It be + 形容詞 + of + 人 + to V
   例句：
   It’s possible for a bee to fly among flowers.
   = To fly among flowers is possible for a bee.

    2.

   It be + 要強調的部份 + that + 句子其餘的部份
   例句：
   John gave Mary a book.
   = It was a book that John gave Mary.
   = It was Mary that John gave a book.
   = It was John that gave Mary a book.

   3.

   It seems that + S + V = S + seem to + V
   例句：
   It seems that he was rich.
   = He seems to have been rich.

   4.

   It be + 形容詞 + that + S + V... = 副詞, S + V…
   例句：
   It is certain that Shakespeare is the greatest dramatist that ever lived.
   = Certainly, Shakespeare is the greatest dramatist that ever lived.

   5.

   (1)   It be said that + S + V…
   = People say that + S + V…
   (2) It be well (或truly, wisely) said that + S + V…
   例句：
   It was once thought that cotton was the best material for summer clothing.
   = People once thought that cotton was the best material for summer clothing.

   6.

   It可表「天氣、時間、季節、狀態、距離…等」
   例句：
   (1) It is hot.
   (2) It was Monday.

   7.

   S + V + 補語 + that子句(或to + 動詞)…
   例句：
   Constant practice made it possible that he improved his English.

    8.

   (1)   one…; the other…
   (2)   one…; the others…
   (3)   one…; another…; the other…
   (4)   one…; another…; the others…
   例句：
   (1) I have two pens.  One is red; the other is green.
   (2) He has three English books.  One is at home; the others are at school.
   (3) She has three balls.  One is white; another is blue; the other is black.
   (4) Here are four men.  One is a teacher; another is a dentist; the others are soliders.

   9.

   (1)   Some…; others…
   (2)   Some of the …; the others…
   例句：
   (1) Some children are running; others are singing.
   (2) Some of them learn quickly; the others don’t.

    10.

   A is one thing and B is another
   例句：
   To teach is one thing and to learn is another.

    11.

   that... this... = the former... the latter... = the one... the other
   例句：
   (1) He has a rabbit and a cat; that is afraid of this.
   (2) She has two sons, tim and Peter; the former is stronger than the latter.
   (3) Mary and Helen are classmates; the one is taller than the other.

    12.

   that 可以代替前面提過的事
   例句：
   The tail of the ox is longer than that of the mouse.