表示遗憾的句子：
"If only I had known then what I know now."
（如果当时我知道现在知道的，就好了。）
"I regret not doing it when I had the chance."
（我后悔当时没抓住机会去做。）
"It's a shame things didn't work out as planned."
（很遗憾事情没按计划进行。）
"I wish I could turn back time and do things differently."
（我希望我能够倒回时光，做出不同的选择。）
"I'm sorry for what happened, I wish I could change it."
（对于发生的事情我感到抱歉，但我希望我能够改变它。）
