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number of + 可数名词
例句：
A large number of cows were infected.
There are a number of reasons why I can’t marry you.
A number of people were injured in the explosion.
I had warned her not to go there any number of times, but she wouldn’t listen.
amount of +不可数名词
例句：
The amount of work I got through in July was double the amount that I did in June.
No amount of love would heal the hatred she felt.
I had a certain amount of respect for him: he was a good footballer and a good ambassador for his country.
quantity of （或quantities of）+一般接无生命的名词，可数不可数皆可， 更加正式。
例句：
They have recovered a quantity of petrol bombs at Wolff Close.
There were very small quantities of peppers on sale in the market.
There are very large quantities of gas beneath the North Sea.
例句：
A large number of cows were infected.
There are a number of reasons why I can’t marry you.
A number of people were injured in the explosion.
I had warned her not to go there any number of times, but she wouldn’t listen.
amount of +不可数名词
例句：
The amount of work I got through in July was double the amount that I did in June.
No amount of love would heal the hatred she felt.
I had a certain amount of respect for him: he was a good footballer and a good ambassador for his country.
quantity of （或quantities of）+一般接无生命的名词，可数不可数皆可， 更加正式。
例句：
They have recovered a quantity of petrol bombs at Wolff Close.
There were very small quantities of peppers on sale in the market.
There are very large quantities of gas beneath the North Sea.
