- 9 -
Yes/No Questions

Does time fly?

As with the other purposes for which we use sentences, we can ask questions wthout using the sentence forms particularly associated with questions. In particular, we can use the declarative sentence form to ask a question by saying the sentence with a rising intonation at the end, a slightly higher pitch.. In writing, we express this by adding a question mark to the end of the statement:

(1) (a) Grammar rocks.
(b) Grammar rocks?
This sort of question generally implies that the speaker finds the statement hard to believe.

For a true interrogative sentence form, however, we need at least three words, even to ask a yes/no question about a two-word statement:

(2) (a) Grammar rocks.
(b) Does grammar rock?
(3) (a) Time flies.
(b) Does time fly?
In sentences like this, we have a new word, do, in front of the subject. The tense, which used to be on the main verbs (rocks, flies) is expressed by our new word, leaving the main verb with only the base form of the verb ( rock, fly) behind.

When it is used in this way, do is sometimes considered a modal auxiliary like those we touched on earlier (can, could, will, would, shall, should, may, might, must). As with those modals, the next verb after do is in the base form. If the declarative sentence equivalent has one of the modals mentioned earlier, the modal moves in front of the subject in the corresponding interrogative sentence, and do is not required.

(4) (a) Grammar can rock.
(b) Can grammar rock?
(5) (a) Time could fly.
(b) Could time fly?
(6)(a) I must go now.
(b) Must I go now?
In addition to the modals, English uses be and have as verbs that work with a participle of the main verb to express various meanings we are not yet ready to discuss--that is, as auxiliary verbs or helping verbs. If be or have is the first such auxiliary in a declarative sentence, it carries the tense, and it is moved in front of the subject in the corresponding yes/no question:
(7) (a) Time is flying.
(b) Is time flying??
(8) (a) Time has flown.
(b) Has time flown?

Because we are dealing with auxiliary verbs, the kind of movement rule that describes the relationship between declarative statements and questions about them is sometimes called SUBJECT-AUXILIARY INVERSION. You may encounter this term, but it is not strictly accurate. As sentences (9) and (10) show, when a sentence has more than one auxiliary verb, only the first one is moved in front of the subject. (9)(a) Time may be flying. (b) May time be flying? (10) (a) Time has been flying. (b) Has time been flying?

The auxiliary verb which moves in such cases is either a modal or the auxiliary which is bearing the tense (sometimes called the operator). Because the movement covers only the one auxiliary, we'll just call it INVERSION, leaving it to you to remember what gets inverted.

Not all declarative sentences have auxiliary verbs to move, of course. The general rule is that we cannot move the main verb itself in INVERSION. Shakespeare could do so, but if we do so these days people look at us oddly, though they may understand us. Shakespeare's time had a rule we could call SUBJECT-VERB INVERSION, but we are stuck with our more complicated form of INVERSION. If the tense is on the main verb, we generally have to insert a form of do to carry the tense:

(11)(a) My aunt diets.
(b) *Diets my aunt? UNACCEPTABLE
(c) Does my aunt diet? ACCEPTABLE

One of the things that makes our INVERSION rule complicated is that there are two exceptions to the rule that main verbs can't move. Be and have, which can serve as auxiliary verbs, can move even when they are main verbs. Even this exception has to be qualified a bit: The main verb be always moves in INVERSION, but the main verb have can either move or let do do the work for it: (15) (a) Time is money. (b) Is time money? (16) (a) Time has no pity (b) Has time no pity? (c) Does time have no pity? One of the subtle differences between Standard British English and Standard American English is that questions like (16)(b) are much more common in British usage than in American. Standard American English prefers the use of do when have is a main verb.

The process where by do is added to carry the tense after INVERSION is called DO-INSERTION or DO-SUPPORT, and it has other uses as well, as we'll see in our next section. It is used even when the main verb is do itself.

(17) (a) Time did this.
(b) Did time do this?

Exercise 1: Reversing Yes/No Question Formation

For the following questions, give the equivalent statement before INVERSION and (possibly)DO-INSERTION have applied.
1.01 Do soldiers waltz?
1.02 Does George waltz?
1.03 Does linguistics waltz?
1.04 Did your brother do this?
1.05 Have you seen Tom waltz?
1.06 Is my hair flat?
1.07 Was Grant buried in Grant's Tomb?
1.08 Should I leave you two alone?
1.09 Will it hurt?
1.10 Have you heard?

Diagramming the Tense/Modal Constituent. We have seen that to be grammatically complete, all sentences must have a modal auxiliary or a verb inflected for tense. One of the virtues of looking at simple questions is that they show that this tense/modal constituent can be thought of as separate from the rest of the predicate, since it is moved around the subject in questions. We will want to include this INFL (for "INFLection") element in our sentence diagrams:

Notice that we have labelled it -Pst. That stands for not past tense, just as +Pst would stand for past tense. Using plus and minus signs this way allows us to use just one label (Pst) for tenses. It also captures the fact that we tend to assume by default that sentences are present tense unless they are specially marked otherwise; for that reason, linguists would speak of the present tense as the unmarked tense. We don't really need to label the INFL component at all. We are doing so here just for completeness, rather as we are adding in the not-strictly necessary N and V labels. Our diagrams are still rather small, so we have plenty of room.

We might, however, want to reconsider using S (for sentence) at the top of our diagram. What we have is a diagram of an independent clause, a clause that can stand by itself as a sentence. We are going to use this pattern over and over, though, and it will sometimes be used for just part of a sentence. What we really have, then, is something like this:

Diagramming a Simple Yes/No Question. Thinking of our sentence structure this way helps us to use our diagram for a simple declarative sentence as part of our diagram for a simple yes/no question. In the diagram below, the question is a sentence which is marked as a question (+Q) about the statement which follows. The INFL element has been moved to show that it is a question, leaving behind it a trace where it has been--the trace (t) represents our knowledge that the tense embodied in does applies to the verb fly:

This last diagram brings us closer to the kind of trees used by at least some linguists. In a little bit, we'll try to move closer, at the cost of having to learn some more abstract labels.

Problems With INVERSION and Do. Yes/no questions, even with DO-INSERTION, are a pretty basic part of English, and few speakers have trouble with them. The most frequent error seems to be omission of the tense element altogether, especially in informal speech:

(18) *You crazy?
(19) *You been busy?
(20) *Time fly?

Such expressions should be avoided in writing and in formal speech, and those who can't switch between their use and non-use are the ones most apt to need to study the question rules.

How Much of This Will be on the Test?
By this time you should be able to recognize the most common forms of the different sentence types: exclamatory, imperative, declarative, interrogative. The main lesson in this section is that the interrogative sentence form has a tensed verb or modal moved in front of subject, a process called INVERSION. Where there is no auxiliary verb and main verb is other than be (or optionally, have, DO-INSERTION supplies do as the operator to carry the tense. In our diagrams, we'll show this movement as leaving a trace behind. Any other terms can always be looked up in the Glossary. You should be able to reverse the processes involved in making yes/no questions without changing the tense, and you should be beginning to make sense of our phrase-structure trees.