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These two sentences are both valid

I write this sentence.

I do write this sentence.

Are these both valid?

I am writing this sentence.

I do be writing this sentence.

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The last is wrong. – American Luke Aug 16 '12 at 19:10
Robert Williams might say it do be... yo. – n00b Aug 16 '12 at 19:16
Do be a good fellow, won't you? – Robusto Aug 16 '12 at 19:23
"I do be writing this sentence" sounds like pirate grammar. However, I searched the full text of Treasure Island and it doesn't seem to be used there. – rhuffstedtler Aug 16 '12 at 19:46
"To be is to do" - Socrates "To do is to be" - Sartre "Do be do be do" - Sinatra – MετάEd Aug 17 '12 at 5:33

The rule of Do-Support applies to every main verb in English, except auxiliary verbs.

Do-Support is the process that provides the dummy auxiliary do to carry the tense and swap with the subject in Yes/No- and Wh-Questions

  • Do you still love her?
  • What do you love about her?

tag questions

  • You still love her, don't you?

and negations

  • You don't love her any more.

However, there are two important qualifications for this rule:

  1. The verb be is always treated as an auxiliary verb, even if it's the only verb in its clause. I.e, it can never invoke Do-Support. Which is the answer to the OP's question. Other isomorphs of do can occur with be, however:

    • Do be a "Doo Bee", and don't be a "Dont Bee". - Emphatic do, active noun predicates.
    • What I'm gonna do is be her bodyguard. - Active do, active noun predicate.
  2. The verb have, in its sense of "possess", may be treated

    • either as an auxiliary verb (i.e, commuting with the subject: Have you the time?)
    • or as a main verb (i.e, allowing Do-Support: Do you have the time?)
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Oh, by the way, do is not a modal verb; it's just a dummy auxiliary verb, the same way It in It's easy to tell is a dummy pronoun; they're both put in as markers by the syntax and have no meaning. – John Lawler Aug 16 '12 at 23:52
+1 May I suggest, however, that you add your comment to the answer? It is germane to the issue at hand and not simply a comment on it. – Robusto Aug 17 '12 at 0:25
Is it going to become invisible after a while or something? I do get tired of saying the same things over and over again; the link explains what the modals are, for anybody interested. – John Lawler Aug 17 '12 at 1:21
My point is that people don't always read comment chains. You are, of course, free to do as you like. – Robusto Aug 17 '12 at 15:10
@JohnLawler Right, so negative imperative constructions with BE invoke Do-support for the same reason that other constructions do. There is an auxiliary requirement in the construction which can't be met by another verb. However, this example is different from others because BE is still an auxiliary verb. It just can't perform the required function Is that right? (this is my last comment I promise!) – Araucaria Jul 19 '14 at 16:57

"I do be (something, something)....." is used regularly in everyday speech in South-East Ireland, where I grew up, but it is not regarded well, and a sign of being from a very specific type of rural, working class background. Its used in this context as a continuous present: "I do be always listening to that radio show on my way home from work"

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Interesting! It's also perfectly acceptable in AAVE, but as an emphatic. "I don't think you be studying much based on your grades", "But I do be studying all the time!" – guifa Sep 19 '14 at 18:02

What the second of the first pair is doing is adding emphasis. Because we normally use the auxiliary verb "do" in interrogative and negative sentences, not positive sentences.

Question: Do you like apples?

Positive sentence: You like apples.

Negative sentence: You don't like apples.

However, "do" is used in a positive sentence to add emphasis.


I do believe in fairies, I do! I DO!

If my guess is right and you're trying to duplicate the act of emphasizing in the second pair, then it should be done this way:

First pair:

I write this sentence.

I do write this sentence.

Second pair:

I am writing this sentence.

I am writing this sentence.

As you can see, there is no need to add another auxiliary verb in the second pair because the word "be" or "am" is already one.

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It might turn out a whole lot to memorize, if to learn what verbs go together. You could be better off thinking patterns. You can give the patterns parameters, to have a good language economy. Imagine a map.

[parameter ON the map, generally] the Simple, plain verb _

[parameter IN an area of the map] the Progressive, pattern BE _ ING

[parameter TO a place on the map] the Perfect, pattern HAVE _ 3rd form

[parameter AT a place on the map] the Perfect Progressive, pattern HAVE BEEN _ 3rd

The verb to DO works ON the map. It is not an auxiliary for IN.

I hope this can help. :)

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Could you explain how this actually works in practice? How this links to the question as asked is not clear. – Andrew Leach Sep 19 '14 at 18:02
The question is if a structure as I do be writing is valid. – Teresa Pelka Sep 20 '14 at 12:07
Yes: I know what the question is. What is parameter in your answer? How does your answer work in answering the question? – Andrew Leach Sep 20 '14 at 17:08
You can use auxiliaries with parameters rather than memorize particular structures, this is my answer. – Teresa Pelka Sep 22 '14 at 12:01

All except the last are grammatical, but the second would be found only infrequently. In some regional dialects the construction illustrated by I be writing this sentence is also found.

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