Basic English Syntax with Exercises

whether

7.3.4 The interaction between wh-movement and inversion

While this analysis seems less ad hoc than the assumption of different interrogative complementisers in main and embedded clauses, there are still a number of questions left unanswered. For example, how are we to analyse yes–no questions under the assumption that complementisers are not allowed in main clause complementiser positions? What triggers the inversion in this case if there is no wh-element to agree with? The answer might be that there is a wh-like element in yes–no questions. Although we do not get inversion type yes–no questions in embedded clauses, for obvious reasons, it is still possible to have an embedded yes–no question. These are typically expressed by the element whether:

7.3.4 The interaction between wh-movement and inversion

If we were to put the content of this embedded clause into a main clause it would be should I bring some wine, i.e. a yes–no question. Thus, (54) contains an embedded yes–no question. The wh-element whether is quite strange. In many ways it looks like a complementiser, being a word that appears at the front of an interrogative clause, rather like if. However, there are a number of reasons to believe that whether is not a complementiser. For one thing, it can introduce both finite and non-finite clauses:

7.3.4 The interaction between wh-movement and inversion

Finally consider the fact that the word whether was used in Old English to introduce yes–no questions in main clauses:

7.3.4 The interaction between wh-movement and inversion

Yet Old English did not have main sentences that started with complementisers, indicating that whether never was a complementiser even in former stages of the language.

7.3.4 The interaction between wh-movement and inversion

But if whether is not a complementiser, what is it? It differs in one very large way from wh-elements and that is while wh-elements move out of a clause whether does not seem to. Wh-elements are all moved to the spec CP from some position inside the IP and therefore they are always associated with a ‘gap’ in the clause, filled, of course, by a trace:

7.3.4 The interaction between wh-movement and inversion

But whether is not linked to any position inside the IP from which it has moved. This, I think, is understandable in terms of the functions of wh-elements. Most wh-elements are used in wh-questions and their function is to mark the clause as an interrogative and to indicate what the focus of the question is. (60a), for example is a question about the object, which is the position from which the wh-element derives. As we said, the function of whether is to mark a yes–no question and these questions focus on the truth of the sentence rather than on any particular piece of information it may carry. For this reason, then, whether does not need to hold a position in the clause, it merely indicates the clause’s question status. We may assume therefore that whether is a wh-element that is generated directly in the specifier of CP as a general interrogative operator. As it appears in embedded contexts, it will be accompanied by an interrogative complementiser Q with which it agrees:

7.3.4 The interaction between wh-movement and inversion

What about main clause yes–no questions? Obviously in Modern English, whether is not allowed to appear in main clauses. But we might suppose that something appears in the same position in main clause interrogatives. This is clearly an operator like whether, only phonologically null. Standardly, null operators are denoted by Op: