Find a common phrase for "I don't understand"?
A common phrase for "I don't understand" is "It's beyond me." Additionally, you may also hear people say "I have no clue," or "It's Greek to me" to express that they do not understand something.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find a common phrase for "I don't understand"?

### Output:
A common phrase for "I don't understand" is "It's beyond me." Additionally, you may also hear people say "I have no clue," or "It's Greek to me" to express that they do not understand something.