在非真实条件句中，表示与过去事实相反的假设。
If I had known the truth, I would not have said that to him.
要不是的帮助，我就不能提前完成这项任务。(与过去事实相反的虚拟条件句)。
If it hadn't been for your help, I couldn't have finished it ahead of time.
要不是那个会议，我就参加了你上周六举行的晚会了。(句中动作与过去事实相反)。
If it hadn't been for the meeting, I would have gone to your party last Saturday.
要不是那个会议，我就参加了你上周六举行的晚会了。(句中动作与过去事实相反)。
If it hadn't been for the meeting, I would have gone to your party last Saturday.
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