When some form is used in the utterance, the function of the form is different according on the environment. And in some cases, an utterance, depending on the properties of the utterance, itself is not appropreate for some environments. So it is important that teachers present the environment and the way how to prompt the utterance as the target, when they present the form. From this point of view, this paper, based on considerations and analysis about the properties and functions of the utterance, provides an approach how to present a form to learners. As an example : I pick up "tai-form", which is one of the items in the beginners' class.
