"We have sent you the prize."

Translation: Wysłaliśmy ci nagrodę.

[WaFeKiS]

Czemu nie: Wysłaliśmy Panu nagrodę

[MajikRuth]

What's the difference between wysłałyśmy and wysłaliśmy?

[Jellei]

-łyśmy ending = 'we' are only women.

-liśmy ending = there is at least one man among 'us'.

[MajikRuth]

Thanks!

[AlisonSinc]

Why is 'cię' wrong?

[alik1989]

"You" is an indirect object here (to whom), so you need dative.

[AlisonSinc]

Of course! Wasn't thinking...

[julie2016b]

how do we know this is plural you???

[Jellei]

We don't, both are equally correct and accepted.