ついでながら申し上げますがの英語

I take this occasion―take this opportunity―to thank you.

I respectfully beg to state that...

I beseech your favor.

tell；inform

I'd like to express my sympathies.

I leave everything to you.

Please, sir

we look forward

I tell you this for your private information

I offer my congratulations

If you would be so kind.

Thank you.

for land's sake ＝land('s) sake＝ land sake's (alive)

Best regards,

A thousand pardons!

I offer my congratulations

You will please exert yourself in my behalf―I leave my affair in your hands―（初対面の挨拶なら）―I hope we shall have a good time together.

I'm begging you.

We ask for your cooperation during the period.

In that ease, I shall ask you to do so.

I offer you my hearty congratulations.

Congratulations

Ladies and gentlemen, may I just say a few words by way of greeting.

I sincerely pray for you.

You have my sympathies.

Thank you very much.

of a person, to hesitate to talk about something to someone