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。
Just to add, for the record...
Whenever it's convenient for you is fine.
If I may be so bold, let me make a suggestion.
I'm terribly sorry, but could you bear with me a moment?
If it's alright, could I have a moment later?
I'm sorry, this is on my end, but...
Forgive me for asking, but...
Just so you know, I'll mention this.
There's no rush on your reply, take your time.
To put it without ruffling any feathers...
Just do what you can, that's fine.
I'm sorry for the trouble, but thank you in advance.