Japanese phrase
参加できません。 san ka de ki ma se n
Meaning
I can't participate.
When to use it
States that participation is not possible. The polite wording gives a clear but gentle refusal in everyday situations.
Example dialogue
明日の集まり、参加できますか？ asu no atsu ma ri san ka de ki ma su ka
Can you join tomorrow's gathering?
すみません、参加できません。 su mi ma se n san ka de ki ma se n
Sorry, I can't participate.