一、直接表达后悔的常用句型

1. I deeply regret the choices I made and the opportunities I missed.（我深感后悔我所做的选择和错过的机会。）

2. I am filled with remorse for the mistakes I have made and the pain I have caused.（我为所犯错误和造成的痛苦充满悔意。）

3. The weight of my regret is unbearable.（我后悔的重量难以承受。）

4. I regret doing that. 我后悔那样做。

二、表达遗憾与后悔相近情感的句型

1. If only I had done things differently.（要是我当初做些不同的事就好了。）

2. It's too late now. 现在后悔也晚了。

3. I shouldn't have taken that risk. 我本不该冒那个险。

4. This decision could be one I live to regret. 这个决定或许会成为我终身的遗憾。

三、从后果角度表达后悔

1. The consequences of my actions haunt me. 我的行为后果一直困扰着我。

2. I wish I had known the outcome before. 我真希望事前能预见到结果。

3. This mistake cost me more than I imagined. 这个错误给我带来的损失超出了想象。

四、口语化表达

1. I feel terrible about what I did. 我为所做的事情感到羞愧。

2. I can't stop thinking about what I should have done. 我不停地后悔没有早点采取行动。

3. I'm sorry for the pain I caused. 我为给他人带来的痛苦道歉。

这些句型可根据具体语境灵活运用，注意选择与情感基调相符的表达方式。