Question

Three early forms of written communication were

Answer 1

Hihi!

Hieroglyphs, hieroglyphs (pictures carved into rocks), and cuneiform (a writing system using hash marks on clay tablets) were all early forms of written communication. All of them were precursors to alphabets, which use letters to represent sounds. Grunts are an early (and present-day) form of communication, but they aren't written. 

I hope I helped!
-Jailbaitasmr<span />