Rebecca

My son, is reading using the Headsprout program- he can decode and works well when given a list of vocabulary words as spelling words. We call out the words and he writes them down. He does well with this task. However, when he spontaneously generates words on his own, he almost always misspells words that he should know and he often leaves out vowels. Yesterday, he wrote me a note that said " I lc sm kac." He read it to me and he said that he wrote "I like some cake." These are ALL words that he can read, decode and spell during lessons! Help!