one 指代上文提到的人或物，前面可以加定冠词，可以有自己的定语，还可以有复数形式。

　　Your answer is a good one.

　　I don't like coloured envelopes. I like white ones.

　　(三)each， every

　　each 和every表示“每一个”，every 在句子中只能作定语，each 可以作主语、宾语、定语、同位语。

　　The headmaster shook hands with each of the teacher.(shake hands with 握手)

　　The students try to set aside a little money each month.(set aside 节约)

　　From each according to his ability， to each according to his needs(work)。各尽所能，按需分配。

　　I have every reason to believe that she can finish the job well.

　　There is every possibility of our winning the game.

　　every 还常用在every little while (每隔一会)，every other day， every three days(每隔两天)，every ten miles(每隔十英里)， every now and then (不时)，every four years， every other line， one out of every three students.

　　(四)few， a few， little， a little， many， much

　　few， a few， many 修饰或指代可数名词，little， a little， much修饰或指代不可数名词。few， little表示否定，a few， a little表示肯定，much常用于否定句中。

　　Many hands make light work. 人多好办事。(谚)

　　Few words are best. 话少最好。(谚)

　　They don't take much interest in it.

　　I know little about it.

　　There's a little water left in the jar.

　　Few of them have been to India.

　　I've read a few books written by Dickens.