Re: irregular Verb Let

Originally Posted by
Maral
then how about business english
We are letting you know....... i guess it's incorrect/ I

would rather say: we kindly inform you.......
I can't agree that it's incorrect.
It's certainly more formal -- and therefore more expected -- to say "informing you" than "letting you know."
(I don't see "kindly" used often in business correspondence.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.