As speakers, we create comprehensible clauses spontaneously and automatically .Written languages can have a greater complexity of clauses than speech within sentences .this is because writing can be considered by the reader at any time and at any speed. Speech, on the other hand must be taken in immediately by the listener. The term "clauses" belong to the discipline of descriptive grammar. This approach is very traditional and has been taught in grammar schools for the past few hundred years. It is still considered useful as a term by which to identify the components of a sentence. Transformational grammar is an alternative and more function approach to understanding grammar. This focuses on the relationship and function of parts in an utterance, and seeks to accommodate an infinite variety of expressions and usages.
