It is crucial for teachers to embed whatever sounds or sound patterns are the focus of instruction within connected stretches of speech. Other than very brief lesson segments when teacher may introduce a specific pronunciation point for the first time, it is almost always more effective to illustrate and practice sound within contexts of whole phases, short sentences, and interactive classroom task. Activities that provide opportunities for learners to communicate meaningfully with each other are more interesting, enjoyable, and memorable.
in the long run, such activities have more of an impact on enhancing speech intelligibility