日本語をクリックすると英文が表示されます。まずは自分で英語にしてから答え合わせを。
For various reasons, I have to decline this time.
I truly wish I could help, but...
I'm glad you asked, but I have other plans.
The timing's bad; it's hard right now.
Sorry, but I don't think I can help this time.
It's a generous offer, but I must decline.
I'd love to, but it looks difficult.
Let's just say it wasn't meant to be this time.
Honestly, I've got my hands full right now.
If I had more room, I'd have taken it on.
I appreciate the thought, but I'll pass.
Unfortunately, that's outside my expertise.