Sorry for not being able to help you.
或
I am sorry that i was not able to help you.
我认为这里应该用be able to，表达是客观上不可行不是主观上不愿意。
I'd like to, but it's over my power
我想帮你,但是这超过了我的能力
Sorry,I can't help you.
抱歉 我无法帮助你
I feel so bad about not being able to help you.
不能帮助你,我真感到抱歉。
1.Sorry for not being able to help you.
2.I'd like to, but it's beyond my power .要用beyond 哦！
I am sorry , I can not ( can't ) help you .
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