I have a question about a construction found in "Second Year Latin - Part 1 - Selections of Easy Latin, J.B. Greenough", one of the downloadable books from Textkit, in the "Learn Latin" Section.
It is in second sentence in the very first paragraph, on page 1:
"Hanc epistulam ad te laetus scribo."
My question has to do with the "ad te". Why isn't the dative used instead: tibi? Hence, why not: Hanc epistulam tibi ...