I was reading the commentaries of Rashi and came across Genesis 29:27 where he
says:
and we will give to you: [This is] a plural expression, similar to (above 11;3,
7), "Let us descend and confuse" ; "and let us fire them." This, too, is an
expression of giving.
ונתנה לך:
לשון רבים,
כמו (לעיל יא ז)
נרדה ונבלה,
(שם ג) ונשרפה,
אף זה לשון
וניתן:
here is the link:
http://www.chabad.org/library/bible_cdo/aid/8224/showrashi/true