事与愿违用英语可以表达为 "things don't always go as planned" 或 "life doesn't always go according to plan." 这个短语源于中文，意思是事情并不总是按照计划进行。

一些例句和翻译如下：

"Things don't always go as planned, but that's okay." （事与愿违，但没关系。）

"Life is full of surprises, and not all of them are good. But that's just the way things go sometimes." （生活充满惊喜，但并非所有都是好的。但这就是事情的走向。）

"It's important to have a plan, but it's equally important to be flexible and adaptable when things don't go as planned." （有计划很重要，但当事与愿违时，灵活适应同样重要。）