1、 one用来指代“同名异物”的可数名词单数.
例如:
（1)－Do you have a car?
－Yes， I have one. I have a good one。 （one = a car）
（2）Yesterday I have lost my pen. I”m going to buy one after school. (one= a pen)
(3）The story he told us was more interesting than the one we heard yesterday. （the one = the story）
2、 ones用来指代“同名异物”的可数名词复数。
例如:
(1)－Do you want a toy?
－Yes， I want new ones very much。 (ones= toys）
（2）Stone bridges last longer than wooden ones. （ones= bridges)
(3）Teachers like the students working hard， especially the ones who are active in thinking。 （the ones= the students）
3、 that用来指代“同名异物"；的可数名词单数或不可数名词。
例如:
（1）The engine of your car is better than that of mine。 （that= the engine)
(2)The book you bought yesterday costs less than that I had bought before. （that= the book）
（3）The weather of Beijing is as good as that of Tianjin. （that= the weather）
(4)He often tells us the news of his country and that of his country nearby。 （that= the news)
4、 those用来指代“同名异物”的可数名词复数。
例如：
（1）The houses of the rich are generally larger than those of the poor. （those= the houses）
(2)The bikes made in China are as good as those made in USA。 （those = the bikes）
