“无能为力”常见的英文表达有 “be powerless to do something”、“be unable to do anything about it” 或 “have no power/ability to do something”。以下为具体例句：
1、 I'm powerless to change the situation.
（我无力改变这种局面。）
2、 We were unable to do anything about it.
（我们对此无能为力。）
3、 I have no ability to help him in this matter.
（在这件事上，我无能为力帮他。）
这些表达都能准确传达“无能为力”的含义，具体使用哪个可根据语境和表达习惯选择。