由于我同学生病了不能参加你的生日晚会,真的好遗憾 翻译成英文怎么说

It's really a pity that my classmates are ill, and they can not attend your birthday party,
如果是单数的.一个人生病了.
It's really a pity that my classmate can't attend your birthday party because of his illness.

It's a pity that my classmate can't attend your birthday party because of his illness.

It’s really a pity for my classmate that he‘ll miss your birthday party for his illness.

I really regret that I couldn't attend your birthday party because of my classmate‘s illness。
It's a pity that I couldn't go to your birthday party because of my classmate‘s illness。

it's a shame+that从句
it's a pity+that从句
两者都表示"真遗憾......"
It's a shame that i am not able to attend your birthday party because my classmate was sick.
It's a pity that i am not able to attend your birthday party because my classmate was sick.