eng
I'm sorry I'm unable to attend your party.
eng
I'm sorry I'm not able to attend your party.
eng
I'm sorry I can't attend your party.
eng
I'm sorry that I'm not able to attend your party.
epo
Mi bedaŭras, ke ne eblos al mi ĉeesti vian festeton.
jpn
残念ながらあなたのパーティーには出席できません。
tur
Partine katılamadığım için üzgünüm.

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