Informal / Formal sentens

Informal	Formal
What do you need?	Please let us know your requirements.
Thanks for you email of 12 Feb.	Thank you for your email received 12 February.
Sorry, I can't make it.	I am afraid I will not be able to attend.
I'm sorry to tell you that, …	We regret to advise you that …
I promise	I can assure you that …
Could you ..?	I would be grateful if you could …
You haven't ..	We note from our records that you have not …
Don't forget	We would like to remind you that …
I need to …	It is necessary for me to …
Shall I … ?	Would you like me to … ?
But … / Also … / So …	However…/ In addition … / Therefore …
Please could you …	I was wondering if you could …
I'm sorry for	Please accept our apologies foe …
See you next week.	I look forward to meeting you next week.
Re ..	With regard to … (or with reference to)

requirements - wymagania

receive - otrzymać

attend  - być obecnym

assure - zapewniać

with regard to sth - w odniesieniu do czegoś

re - co się tyczy, odnośnie, w sprawie

it is necessary for sb to do sth - ktoś musi zrobić coś

wonder - zastanawiać się

In addition – dodatkowo

Therefore – dlatego, zatem