We have now reached the two top levels in the Grammatical Hierarchy (Figure 1.1, p. 2), clauses and sentences. In this chapter, we will define both of these terms, and then discuss them in turn. We begin with clauses, under the general heading of ‘Subordination’ (4.2). In 4.3, we look at Coordination, which is how constituents can be linked together in a sentence. Finally, in 4.4, we look at a variety of sentence types.