Language in everyday use is not conducted in terms of isolated, separate units; it is performed in connected sequences of larger units, in words, phrases and longer utterances. And there are actually some remarkable differences between the pronunciation of a word in isolation and of the same word in a block of connected speech. Though these changes are mostly quite regular and predictable, there is still problem of defining the phonemic status of sounds in connected speech. It happens because of the numerous modifications of sound in speech. These modifications are observed both within words and at word boundaries.