 Let's take the sentence, Mary will never read the books at home. As we know, it can be represented as an inflectional phrase. But what happens if we introduce the sentence by a complementizer such as that, as in, I think that Mary will never read the books at home? The simplest solution is that the complementizer and the inflectional phrase are sisters of a higher mother node. However, there is cross-linguistic evidence that such an analysis is too simple. For example, there are languages that have sentence-initial WH elements, such as in German dialects, Dean Wenn, present-day English equivalent, who-if, or Dutch, where forms such as which that can be used. In other words, we can build a constituent where the complementizer, which is widely held to be the syntactic head of a full clause, and the inflectional phrase, have a common mother node. That consequently has to be called C-bar. The top-level node is now the complementizer phrase with an optional specifier, which typically is a position for WH elements such as who or how. So this is the complementizer phrase analysis, which is the X-bar equivalent of a full clause, originally labeled S.