"No, no, sir; no, not against you!" It was a woman's voice, and Mrs. Barrymore, paler and more horror-struck than her husband, was standing at the door. 

Her bulky figure in a shawl and skirt might have been comic were it not for the intensity of feeling upon her face.

请教老师：

分析Her bulky figure in a shawl and skirt might have been comic were it not for the intensity of feeling upon her face.

同学们说这是虚拟语气，我认为不是，我的理由是：

如果是虚拟语气，根据这里的场景，虚拟语气主从动词形式应该一致，不可能是错综虚拟，不然说不通，所以如果是虚拟语气，

则要变为Her bulky figure in a shawl and skirt might have been comic HAD it not BEEN for the intensity of feeling upon her face.   (主从都是对已经发生的事实的假设，因为主从的动作是同时发生的）。

所以，原句might have been是对过去已经发生的事实的推测（可能性），而不是虚拟相反的假设。应该翻译成：要不是...她当时可能会很滑稽。

还是请假老师来分析批评指正！