a number/sum/quantity/deal/amount of哪些接可数,哪些接不可数,哪些都接?

a number of加可数 the number加名词的复数 但谓语要用单数 eg:a number of students in our class are 55. the number of students in our class are 55. quatity deal 可数amount不可数

a deal a deal of a good deal a good deal of a good many a great/a large amount of /quantity of/large number of区别在于有些加不可数

amounts of+可数名词复数 an amount of+不可数名词
a deal of+不可数名词 a number of+可数名词复数
a sum of +不可数名词 a quantity of +不可数名词/ 可数名词复数