如果我等待更长时间,这个问题就不会发生.（与过去事实相反）
If I had waited for longer time,this problem wouldn't have happened.
虚拟语气
1） 与过去事实相反,从句谓语动词用过去完成时,主句动词为情态动词＋完成时态.
e.g.If I had come here yesterday,I would have seen him.
2） 与现在事实相反,从句谓语动词用一般过去时,主句动词为情态动词＋动词原形.
e.g.If I were a teacher,I would be strict with my students.
3） 与将来事实可能相反,从句谓语动词用过去将来时,主句动词为情态动词＋动词原形.
e.g.If it should snow tomorrow,they couldn’t go out.
主句谓语动词为情态动词（should,would,could）＋和相应的从句一致的动词形式.
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回答时间：2024-04-30 07:58
