1. I have lost my umbrella; I'm looking for 2. I have lost my umbrella; I think I must buy 3. The umbrella you bought is cheaper than bought.
1. it代替同一事物，即同名同物。 I like the car, but I have no enough money to buy it. 2. one代替同名异物中的任何一个,即同名异物. I like cars, but I can’t afford to buy one. 3. that代替同名异物中特指的事物. The doctor in our school is younger than that in their school.
（替代词that在该句中特指“The doctor in their school ”, 以区别“The doctor in our school ”）
1. The doctor in our school is younger than that in their school. (that代替 )
2. The weather of this week is worse than that of last week. (that代替 ) 3. A chair made of steel is stronger than one made of wood. （one代替 )
区分：one为泛指, 相当于a／an＋名词; that为特指, 相当于the ＋名词。
1. Mary's handwriting is far better than
2. I haven't a pen. Can you lend me_____?
3. If I can stop her coming to you, I shall do_____. 4. The information on the Internet gets around more quickly than in the newspaper. 5. This bag is too small. Please give me a bigger 6. The air in the countryside is fresher than . in cities.
7. My shoes are the same as
you wear yesterday.
8. There were a few young people and some older the house.
1. The water in the cup is hotter than it in the pot. 2. The computers in your office are more expensive than those in our school. 3. The pronunciation of the English words is quite different from it of the French words. 4. The library of our school is bigger than one of yours. 5. The car which I want to buy is much more beautiful than it he has. 6. Do you need my pen? No, thanks. I have got it. 7. Today's cellphones are smaller than that used in the past.