make contribution to 的contribution什么时候用复数,什么时候用单数?

例句:I must work hard to make contribution to our country in the future. The real idols are those who are making the greatest contributions to our society.为什么第一个contribution单数,第二个复数?

第一句泛指抽象的贡献，一切贡献
第二句指各行各业的人们做的各种贡献

make contribution,make a contribution ,make contributions,此3形式都存在,只是make a contribution 常表示“捐赠”而其他形式既可表示“捐赠”也可以表示“贡献”请看例句: if you would like to make a contribution by check, please make it payable to "fightsma" and mail it to: fightsma, 1807 libbie avenue, suite 104, richmond, virginia 23226. click here to find out about ways to make a contribution to the fight against spinal muscular atrophy with things you do everyday. there are so many ways that you can make a contribution. how did socrates make contributions to math or science? self-employed persons can opt to make contributions on a monthly or yearly basis. chinese women make contributions to the world of sports. to make contribution to the world peace. donation yes! i want to make contribution to the door of hope.

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