I’d be sorry if you were to think that I disliked you. 若是你认为我不喜欢你，那我就太伤心了。
If it were to rain, we would have to cancel the match tomorrow. 假如下雨, 我们只好取消明天的比赛。
If I were to tell you / Were I to tell you that I killed him, would you believe me? 假如我对你说是我杀死了他, 你相信吗?
If I were to do that / Were I to do that, what would you say? 如果我做了那件事，你会说什么呢?