Английского

Be off! → I demand that you be off. Do be careful with the papers! → My request is that you do be careful with the papers. Do as I ask you! → I insist that you do as I ask you. About turn! → I command that you turn about.
Let us take it for demonstrated, then, that the imperative verbal forms may be looked upon as a variety of the spective, i.e. its particular, if very important, manifestation.*
At this stage of study we must pay attention to how time is expressed with the analysed form. In doing so we should have in mind that, since the expression of verbal time is categorial, a consideration of it does not necessarily break off with the formal principle of observation. In this connection, first, we note that the infinitive stem taken for the building up of the spective is just the present-tense stem of the integral conjugation of the verb. The spective be, the irregular (suppletive) formation, is the only exception from this correlation (though, as we have seen, it does give the general pattern for the mood identification in cases other than the third person singular). Second, we observe that constructions with the spective, though expressed by the present-stem of the verb, can be transferred into the past plane context. Cf.:
It was recommended that the elections start on Monday. My orders were that the guards draw up. The agreement stipulated that the goods pass customs free.
This phenomenon marks something entirely new from the point of view of the categorial status of the verbal time in the indicative. Indeed, in the indicative the category of time
* Cf. L. S. Barkhudarov's consideration of both varieties of forms under the same heading of "imperative".
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is essentially absolutive, while in the sphere of the subjunctive (in our case, spective) the present stem, as we see, is used relatively, denoting the past in the context of the past.
Here our purely formal, i.e. morphemic consideration of the present stem of the subjunctive comes to an end. Moreover, remaining on the strictly formal ground in the strictly morphemic sense, we would have to state that the demonstrated system of the spective mood exhausts, or nearly exhausts, the entire English oblique mood morphology. See: [Бархударов, (2), 129]. However, turning to functional considerations of the expression of the oblique mood semantics, we see that the system of the subjunctive, far from being exhausted, rather begins at this point.
§ 4. Observations of the materials undertaken on the comparative functional basis have led linguists to the identification of a number of construction types rendering the same semantics as is expressed by the spective mood forms demonstrated above. These generalised expressions of attitudes may be classed into the following three groups.
The first construction type of attitude series is formed by the combination may/might + Infinitive. It is used to express wish, desire, hope in the contextual syntactic conditions similar to those of the morphemic (native) spective forms. Cf.:
May it be as you wish! May it all happen as you desire! May success attend you. I hope that he may be safe. Let's pray that everything might still turn to the good, after all. May our friendship live long.
The second construction type of attitude series is formed by the combination should + Infinitive. It is used in various subordinate predicative units to express supposition, speculation, suggestion, recommendation, inducements of different kinds and degrees of intensity. Cf.:
Whatever they should say of the project, it must be considered seriously. It has been arranged that the delegation should be received by the President of the Federation. Orders were given that the searching group should start out at once.
The third construction type of the same series is formed by the combination let + Objective Substantive+Infinitive. It is used to express inducement (i.e. an appeal to commit
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an action) in relation to all the persons, but preferably to the first person plural and third person both numbers. The notional homonym let, naturally, is not taken into account. Cf.: