Subjunctive I is close to the Suppositional mood in its meaning (i.e. represents the action as problematic but not contradicting to reality, that is as desirable, suggested, supposed, etc.).
I. Subjunctive I has only one form - the form which is homonymic with the form of the Indefinite (Simple) Infinitive:
I
be, write
he/she/ it
we
you
they
Subjunctive I is never used with the reference to the past.
Subjunctive I is never used with the negation.
The use of Subjunctive I.
¹
The usage
The example
1.
In simple sentences (usually exclamatory) with an optative meaning.
So be it! Success attend you! God bless you!
2.
In subject clauses after the principal clauses denoting subjective appraisal of the action or situation described in the subordinate clause (e.g. it is necessary/ impossible/ strange/ annoying/ a shame/ a pity/ etc. + that).
It's incredible that she rise so early.
3.
In object, predicative and attributive clauses after verbs and nouns denoting suggestion, demand, recommendation and order (e.g. todemand/ insist/ suggest/ advise/ request/ etc; suggestion/ advice/ recommendation/ etc. + that).
He suggested that we take part in the party.
4.
In object, predicative and appositive clauses after the expressions denoting feelings (e.g. tobe glad/ afraid/ sorry/ anxious/ etc. + that).
He was sorry that we miss the concert.
5.
In object, predicative and appositive, clauses after the expressions of fear (e.g. to fear, toworry, to be afraid, for fear, worry, etc.) with the conjunction lest.
They were afraid lest we be late.
6.
In adverbial clauses of purpose after the conjunctions' in case, in order that, so that.
Close the window so that we be warm.
THE SUPPOSITIONAL MOOD
The Suppositional represents the action as problematic but not contradicting to reality (i.e. as desirable, suggested, supposed, etc).
I. should + the simple inf. - the non - perfect form - refers the action to the present or the future, i.e. expresses simultaneousness.
II. should + the perfect inf. - the perfect form - refers the action to the past, i.e. expresses priority.
The use of the Suppositional Mood.
¹
The usage
The example
1.
In subject clauses after the principal clauses denoting subjective appraisal of the action or situation described in the subordinate clause (e.g. it is necessary/ impossible/ strange/ annoying/ a shame/ a pity/ etc. + that).
It's incredible that she should have risen so early.
2.
In object, predicative and attributive clauses after verbs and nouns denoting suggestion, recommendation and order (e.g.to demand/ insist/ suggest/ advise/ request/ etc; suggestion/ advice/ recommendation/ etc + that).
He suggested that we should takepart in the party.
3.
In object, predicative and appositive clauses after the expressions denoting feelings (e.g. tobe glad/ afraid/ sorry/ anxious/ etc. + that).
He was sorry that we should have missed the train.
4.
In object, predicative andappositive clauses after the expressions of fear (e.g. to fear, to worry, to be afraid, for fear, worry, etc.) with the conjunction lest.
They feared lest we should be late.
5.
In adverbial clauses of purpose after the conjunctions in case, in order that, so that.
Close the window so that we should not be cold.
NOTE: the Suppositional Mood is used in the British variant of English, especially if the sentence is emotionally coloured.
