Author: Indigo Curnick
Date: 2026-07-18
English relies on word order to communicate meaning. This presents us with a big problem though - how can we express meanings which other languages place into extensive case and inflection systems? English cleverly solves this by use of the operator and in some cases even introducing a dummy operator. An operator is an additional verb which helps communicate meaning alongside the main verb, while a dummy operator is verb inserted just to fulfil some grammatical functions. In this blog, we'll look at how to analyse sentences containing such operators and their use. By the time we've finished you should have no trouble identifying the operator of any sentence.
We can begin by thinking about dividing a sentence into a subject and predicate. The subject is what the sentence is "about". The predicate is everything else. Let's see some examples:
| Subject | Predicate |
| I | can speak French |
| The man with the champagne in his glass | is happy |
| The car | is outside the house |
For the purposes of this blog, we will divide sentences now into three parts: the subject, the operator and the rest of the sentence. An operator is the first or only auxiliary verb in a verb phrase. A verb phrase is the part of the sentence which contains the verb. Some examples:
| Subject | Operator | Rest of the Sentence |
| I | can | speak French |
| The man with the champagne in his glass | is | happy |
| The car | is | outside the house |
We can form questions in English by reversing the order of the subject and operator. This is, creatively, called subject-operator inversion. This converts a declarative sentence into an interrogative sentence. A declarative sentence is one which states facts. An interrogative sentence is one which seeks information. By convention, when writing interrogative sentences, we end the sentence in a question mark. In spoken language generally a rising tone is used at the end of the sentence to indicate a question. Sometimes, especially in spoken language, the subject-operator inversion does not take place and simply a rising tone is used instead. Some examples:
| Operator | Subject | Rest of the Sentence |
| Can | I | speak French? |
| Is | the man with the champagne in his glass | happy? |
| Is | the car | outside the house? |
When writing spoken language, a question without subject-operator inversion can be written with a question mark to imply a rising tone:
- The car is outside the house?
There is a short list of verbs which can be an operator, which are broken into two classes: the primary auxiliaries and the modal auxiliaries. The exhaustive lists are:
- Primary auxiliaries: to be, to have, to do
- Modal auxiliaries: can, could, may, might, must, shall, should, will, would (marginally we could include: ought (to), need, dare)
We can negate a sentence by placing not after or appending n't to the operator:
| Subject | Operator | Rest of the Sentence |
| I | can't | speak French |
| The man with the champagne in his glass | is not | happy |
| The car | isn't | outside the house |
Operators can also carry stress, which is mostly used in spoken language:
- A: Finish your homework.
- B: I HAVE finished it.
In written language, this might be indicated with italics instead:
- A: Finish your homework.
- B: I have finished it.
However, many sentences simply do not have an operator:
| Subject | Operator | Rest of the Sentence |
| Kieth | / | works for the electric company |
| She | / | plays with her dolls |
| The car | / | speeds down the motorway |
Which raises a problem: how can these sentences be turned into questions if there is no operator to invert with the subject? We insert a dummy operator - to do - to fulfil grammatical purposes:
| Operator | Subject | Rest of the Sentence |
| Does | Kieth | work for the electric company? |
| Does | she | play with her dolls |
| Does | the car | speed down the motorway? |
Also take not of how the verbs changed form e.g. works -> work.
The same is true for negated sentences:
| Subject | Operator | Rest of the Sentence |
| Kieth | doesn't | work for the electric company |
| She | does not | play with her dolls |
| The car | doesn't | speed down the motorway |
We saw earlier, but the verb to be can actually be used as an operator when it is also the main verb, but only when it is the only verb in the sentence. To be is a very special verb in English which gets lots of exceptions:
- It was a sordid affair
- Was it a sordid affair?
The verb have also gets this special operator status:
- Nova has a boyfriend already.
- Has Nova a boyfriend already?
However, using has in this way is generally not seen in conversational English and reserved for more formal English. Even then, I'd say this use is relatively less common these days. There's two alternative ways to form a question with has:
- Introduce do as a dummy operator anyway
- Substitute get in as the main verb
So for example:
- Does Nova have a boyfriend already?
- Has Nova got a boyfriend already?
I'd say that introducing do as a dummy is the most common way to handle this, while introducing got is seen as very informal.
We've seen how English communicates meaning through the use of operators. This gives you the ability to identify the operator of a sentence, but also think about the structure of sentences more carefully. I hope understanding the operator gives you a deep appreciation for the grammar of English, and how it has developed to solve the problems of communication.
References
Murray, L. (1859 (1795)) English Grammar Adapted to the Different Classes of Learners. With an Appendix, Containing Rules and Observations, for Assisting the More Advanced Students to Write with Perspicuity and Accuracy. John Murphy & Co.
Greenbaum, S., Nelson, G. (2002) An Introduction to English Grammar. Pearson Education Limited
Quirk, R., Greenbaum, S., Leech, G., Svartik, J. (1985) A Comprehensive Grammar of the English Language. Longman.