Write. The spaces don't work yet, and it's a little messy, and it can't handle punctuation, but it's pretty good so far.
This is how it works, in case you were wondering: There is a variable called var1 and a list called Word. At the start, it takes the first letter of your answer and makes that into a single list item. Then var1 changes its value by 1, and the SECOND letter of your answer gets turned into a list item of its own. That repeats until there's no more letters of your message to deal with. Then, the sprite uses another variable, var2, to do a similar thing: it interprets the list items and responds accordingly, changing its costume to the appropriate one, according to the letter of the list item. It then creates a clone of itself and moves X20 over, and repeats the process until there are no letters left.