1. An apparatus for recognizing sentences of speech, said sentences comprised of utterances separated by pauses and including both isolated words and connected words taken from a predefined finite size vocabulary, said apparatus comprising: means including a bandpass filter bank for forming frames of digital signals representative of said sentences of speech; and microprocessor means for recognizing said sentences from said frames of digital signals in accordance with a predefined syntax; wherein said means for recognizing said sentences further comprises; memory means for storing said predefined vocabulary as isolated word templates and partial phrase connected word templates; means for detecting the endpoints of said utterances and for generating an output representative of such endpoint detection; isolated word recognizing means responsive to the output of said endpoint detection means for recognizing said isolated words by comparing selected ones of said isolated word templates with said frames of digital signals; connected word recognizing means responsive to the output of said endpoint detection means for recognizing said connected words by comparing selected ones of said partial phrase connected word templates with said frames of digital signals; and means for selecting said selected ones of said isolated word and partial phrase connected word templates and combining said recognized isolated words and connected words into said sentences in accordance with said predefined syntax.