provided that 是if one is provided that 的简化Electoral College，即provided 的逻辑主语是“受该过去分词支配”的句子主语。如：
Any two persons may marry in Scotland provided that both persons are at least 16 years of age on the day of their marriage. 在苏格兰，如果双方均年满16岁就可以结婚。
（= if the two persons provided that they are …如果给这两个人被提供给他们双方均年满16岁）
This new film will attract the crowds, whatever its quality, provided that it gets played up in the right way. 如果广告做得好，那么，无论这部新片子的质量如何，都会吸引许多观众的.
（= if the new film is provided that it gets played up in the right way 如果新电影得到广告做得好的条件）

相反，providing that 的逻辑主语是“支配该现在分词”的句子主语。如：
Providing that you exercise due care, there is no reason why you shouldn't live to a great age. 只要你适当地注意，你就可享有很高的寿命。
（= if no reason provides that you exercise due care 如果没有理由规定了你适当地注意）
I will go providing that my expenses are paid. 要是我的费用有人代付我就去。
（if I provide that my expenses are paid 如果我有了我的费用有人代付的条件）