#subj II. Formation and use
Subjunctive II non-perfect coincides in its form with the form of Past Simple and its perfect form coincides in its form with the form of Present Perfect.
Usage:
In simple sentence:
After “Oh, that…” to denote wish or regret;
With modal verbs would, could, might to denote desirability, possibility;
Would rather + infinitive to denote preference;
Had better + infinitive to denote advice;
In subordinate nominal object clause in complex sentences
After wish or would rather to denote wish, request, annoyance
In in direct questions after the expression of doubt
In subordinate nominal predicate clause in complex sentences
After a link verb + conj as if/as though
In subordinate nominal attributive-appositive clause in complex sentences
After it’s (high/about) time
In subordinate adverbial clause of unreal condition in complex sentences
In subordinate adverbial clause of concession in complex sentences after even if/even though
In subordinate adverbial clause of comparison or manner in complex sentences after as if/as though