Dear Silvia (Lefevre),
Here is an extract from �A Comprehensive Grammar of the English Language�, (1779 pages, which include more than 700 bibliographical references), by Professor Randolph Quirk and 3 other English professors, assisted by Professor David Crystal, printed 2010, (cost �200). For these reasons, I suggest that some scholars will accept that it carries some current authority.
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SOME MEANS OF EXPRESSING FUTURE TIME.
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Although according to the analysis we have adopted � there is no future tense in English, it is useful at this point to consider the most useful constructions for expressing future time, particularly in independent clauses � . Futurity, modality and aspect are closely interrelated, and this is reflected in the fact that future time is rendered by means of modal auxiliaries, or by the simple present or present progressive forms.
Will/shall + infinitive
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The most common way of expressing futurity is the modal auxiliary construction with �will�, �shall� or � �ll �.
He will be here in half an hour. [1]
Will you need any help? [2]
No doubt I�ll see you next week. [3]
If the crop fails there will be a famine. [4]
The modal verb �will� (or the contracted form � �ll � � ) is used with future meaning with subjects of all three persons. The infrequent modal �shall� is used (especially in Southern British Br E) to indicate futurity, but only with a first person subject.
No doubt I shall see you next week. [3a]
Although �shall� and, particularly, �will� are the closest approximation to a colourless, neutral future, they do cover a range of meanings with modal colouring, from prediction to volition � .) A strong teaching tradition, especially in Br E, has upheld the use of �shall� as the correct form, in preference to �will�, with a first person subject in formal style.
Predictive �will� is particularly common in the clause superordinate to conditional or temporal clauses:
You�ll feel better if/when you take this medicine. [5]
Even where no conditional clause is present, there is nevertheless frequently an implication that the future event or state of affairs will result from, or depend on, the fulfilment of certain future conditions which may not be specified:
Take this medicine. You�ll feel better in an hour or so.
How can you be sure that there will be a change of government at the next election?
Turning to the volitional examples, �will� and �shall� especially with the 1st and 2nd persons often express intention, eg. in making agreements, promises, threats, etc.
How soon will you announce your decision?
We shall ensure that the repairs are carried out according to your wishes.
Other volitional and obligation uses are discussed in � .)
Note:
With a 2nd or 3rd person subject, �will� can also express an abrupt and quasi-military command:
You will do as I say.
Officers will report for duty at 0600 hours.
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Be going to + Infinitive
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Another construction frequently used to express futurity, especially in informal speech, is �be going to� followed by the infinitive. Its general meaning is �future fulfilment of the present�. Looked at more carefully, the construction has two more specific meanings, of which one, FUTURE FULFILMENT OF PRESENT INTENTION, is chiefly associated with personal subjects and agentive verbs:
When are you going to get married?
Leila is going to lend us her camera.
I�m going to complain if things don�t improve.
The other meaning, FUTURE RESULTS OF PRESENT CAUSE, is found with both personal and non-personal subjects:
It�s going to rain. She�s going to have a baby.
There�s going to be trouble. You�re going to get soaked.
As these examples suggest, the association of �be going to� with the present often leads to the assumption that it indicates the proximity of the future event. Unlike �will� and � �ll �, �be going to� is not generally used in the clause superordinate to a conditional clause:
If you leave now, you�ll never regret it.
If you leave now, you are never going to regret it. (Native speakers are unsure about the acceptability of this form - Author)
Note:
However, �be going to� does occur with conditional sentences like the following:
If you�re expecting a first-class hotel, you�re going to be disappointed. [1]
Since the time of orientation for �be going to� is the present, it is used in conditional sentences only when the causal or contingent link between the meanings of the two clauses exists at the present time. In the more usual case, this link is placed in the future, and so �will� is used instead. The special import of �be going to� in [1] above can be emphasized by adding before the subject of the main clause: �I can already tell you that ��.
I hope that this helps the debate.
Les