一大笔钱英语

可以, 不过是amount, 不是mount 而且这种用法通常以书面形式出现比较多

可以，可观的一笔钱或者a large amount of money. a lot of money都可以，别弄复杂了

a large sum of money

一小笔钱 a small sum of money 存钱 deposit money；save money raise money ： 筹钱， 集资 没有rise money 这个说法。

a small amount of money

a large amout of money 你那个听着不习惯.

一大笔钱Alotofmoney

为感谢你的帮助,我们寄上一小笔钱。We send you a small sum of money in acknowledgement of your help.deposit money in a bank 存钱从长远看, 应该存钱以备不测。In the long run, one should save money for emergencies.