Is these sentences are correct? When we got the subway station,found that we have no change for the tickets,neither our credit cards didn't work,the missonary let us get on the vehicle for free,because they thought it wasn't our fault . 我们到了地铁站才发现没带零钱，我们的信用卡也不知道为什么用不了，地铁的工作人员让我们免费乘了车，因为他们觉得不是我们的错。