"多少用多少用英语" 的英文翻译是 "use as much as needed". 这个表达来源于英语中的一个俗语 "Use it or lose it", 意思是如果不使用某物，就会失去它。因此，"use as much as needed" 表示在使用某物时应该尽可能多地使用它。
例句：
Please use as much water as needed to water the plants. 请使用尽可能多的水浇灌植物。
You can take as much time as needed to complete the task. 你可以花尽可能多的时间完成这项任务。
We have plenty of food, so feel free to use as much as needed. 我们有很多食物，所以请尽情使用。