1:a great many 这是可数（许多）
Right now a great many companies are effectively owned by banks
现在,许多公司实际上都是属于银行所有.
2:a great deal of 不可数（大量）
We made a great deal of money,so we decided that it was time to set sail for home.
这使我们大赚了一笔,因此决定该是起程回家的时候了.
3:a number of :可数（若干,一些）
Cracks arising from a number of causes.
由于多种原因所造成的裂缝.
4:a wealth of 可数不可数都可（很多的）
Experience is a wealth of knowledge,is a symbol of wisdom.
经验是一种知识财富,是一种智慧的象征
Even growing a simple garden in your backyard will bring a wealth of benefits.
甚至,仅仅在后院种植一个简单的花园,都将带来很多的好处.
5.a amount of:不可数（大量）
You should spend reasonable a amount of time relaxing and exercising.
你应当花一点时间休息和锻炼.
6.vast amount of:可数不可数都可（大量）
The 15-year-old son spends a vast amount of time text messaging,listening to music or watching TV.
她15岁的儿子每天花大量的时间用在发短信息,听音乐或者是看电视上.
We should give young learners increased access to the Internet so that they can get a vast amount of materials.
我们应该增加年轻人接触网络的机会,让他们通过网络汲取大量的资料.
7：the amount of可数不可数都可（指海关进出口商品贸易方式总值）
Another benefit of reducing the amount of process chemicals is the consequent lowering of production costs.
减少加工过程中化学品用量的另一好处,是可以随之降低生产费用.
Then the amount of the bond,its face value,is paid back.
等到了期限,等于其面值的债券保证金被偿还.
明白了吗?其实不难哦,打的好累,楼主要给分哦.