you.空格drive.forward.when.the.traffic.light.is.right没有上下文,就这样一选择提,选should'nt还是can't还是must'nt?我觉得都可以啊

mustn't 表示，绝不能，禁止 。语气最强。绝不应该闯红灯。

when the film began When the film had begin she said that when did the filim begin. could you tell me why? what time the film

mustn't 表示禁止