Daniel's First Sentence

This evening while I was cooking dinner, Daniel wrote his first sentence:  "Dans is Won Ton." It was inspired by a book we bought yesterday that fascinated Daniel with all it's images of characters especially one called Won Ton who looks kind of like a cross between a mummy and a Ninja.  Daniel copied the words 'Dans' and 'Won Ton' from the book, but figured out 'is' for himself  He did this all of his own accord!  He even at the last minute remembered that to end a sentence you need a dot!  Note on punctuation: More than a year ago, I was writing out a story that Daniel was dictating, and he noticed the comas I was using and asked what they were.  I explained, and even showed him the title of "Panda, eats, shoots, and leaves" by...to explain the use of comas.  He got it!  For several weeks after, he would notice and ask about comas, periods, exclamation marks etc.  So, long before he showed and interest in sentences, he was aware of their uses.  They are simple signs, easy to recognise, and therefore often attractive to young children not yet able to read.  In cartoon books, the exclamation marks stand out, help make the words louder...why not teach them early?!