要表达“韩语无法沟通”这一概念，你可以使用以下几种英语表达方式：
- “I can’t communicate in Korean.”
- “I’m unable to communicate in Korean.”
- “I’m not able to communicate using Korean.”
- “I’m having trouble communicating in Korean.”
- “Korean is not my forte for communication.”
- “I’m not proficient in Korean for communication purposes.”
- “I’m not fluent enough in Korean to communicate effectively.”
- “I’m at a loss for words in Korean.”
- “I lack the ability to communicate in Korean.”
- “I’m not conversant in Korean.”
这些表达可以根据具体语境和需要选择的语气进行适当调整。