The Classification of Words

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Subjunctive Mood Grammemes in Speech
§ 293. As we know, there is not a single subjunctive mood grammeme which has no homonyms in the indicative or in the imperative mood (or both). The discrimination of homo-nymous grammemes rests on the combinations they form and on their occurrence in certain types of sentences and clauses.
§ 294. As already mentioned (§ 240), subjunctive mood grammemes represented by live, be invited, be coming (we may call them 'former present' subjunctive, or 'subjunctive Г ^х) are rapidly falling into disuse, being replaced by the corresponding should grammemes (should live, should be invited, should be coming). Both types of grammemes present an action as problematic, though not actually contrary to reality.
Subjunctive 1 grammemes are decidedly uncolloquial (save in American English), being generally confined to official, elevated style. They are felt to impart official fla­vour, solemnity, bombastic tinge. The should grammemes are stylistically neutral and are therefore employed in dif­ferent stylistic varieties of speech.
§ 295. Representatives of subjunctive' I grammemes can be distinguished from their indicative and imperative mood homonyms as follows.

1. 
   By their left-hand combinability with he, she, it and
   'singular' nouns. Cf. ... he (she, Tom) invite (subjunctive),
   i nv it e\ (imperative), / (we, you, they, students)
   invite (indicative or subjunctive). In other words, subjunc­
   tive I grammemes contain no person and number distinc­
   tions, unlike their indicative counterparts.
   
2. 
   By their being for the most part interchangeable (neg­
   lecting stylistic differences) with corresponding should gram­
   memes. Cf. ... he invite — ...he should invite.
   

Should grammemes have no number and person distinc­tions either. The should — would opposeme is neutralized in the environments in which subjunctive I grammemes are used, the member of neutralization being should.
3) By their regularly occurring in certain types of subor­
dinate clauses (as well as their s/zou/d-synonyms), though
¹ The term was introduced by A. I. Smirnitsky to denote a separate mood. See op. cit, p. 346—350.
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they sqmetimes occur in simple sentences expressing a real­izable wish (Success attend youl), in formulas like Long live ..., God save ..., Far be it from me, etc