He didn’t move. He went rather pale. He hesitated for a moment and then he told me that he had had bad luck at cards for some time. He hadn’t been willing to stick to bridge, he’d been playing poker, and he’d got trimmed. He hadn’t a penny. He’d pawned everything he had. He couldn’t pay his hotel bill and they wouldn’t give him any more credit. He was down and out. If he couldn’t get something to do he’d have to commit suicide.

译文：他没有动弹，脸色变得相当苍白。他犹豫了一会儿，然后对我说，这阵子他牌运一直不好。原来他不甘心老打桥牌，便赌起扑克来，结果输了个精光。他一个子儿也没有，所有的东西都拿去当了。他连酒店账都付不出，人家也不肯再赊账给他。他已经山穷水尽，要是找不到点事干，他只好自杀了。

这段文字用过去时态，为何此段最后一句话用和现在相反的虚拟语气，为何不用和过去相反的虚拟语气？谢谢老师。