permitting weather permitting这里是做定语还是句子的状语?

题目：

weather permitting这里是做定语还是句子的状语?weather ___,we’ll go fishing tomorrow.A is permitted B permits C permitted D permitting如果是状语的话,逻辑主语是we,我们允许,所以是主动.如果是定语逻辑主语是weather,天气被允许,应该是被动.请问是这样么?

解答：

是句子的状语,=if weather permits,