There are many ways to build sentences using the speech system. The simplest is to concatenate a set of words and word-parts using the word numbers in the Phrase ROM. More words can be generated by saying only part of one of the words, and cutting the speech part-way through using the speech processor's reset command, after a carefully calculated interval, which stops the speech.
Click on the picture to play the video of two sentences I cobbled together using this method!