表达悲伤失望情绪的英语口语

我真失策.

***I blew it. *常用俚语,表示'失败"、"失策"、"干了一件蠢事".

I blew it. I lost the customer. (我真失策,失去了那个客户.)

Make sure it doesn't happen again. (再也不要发生这样的事了.)

I screwed up.

I messed up. (我给搞砸了.)

It's all my fault. (全都是我的错.)