Uses of the Subjunctive

A present subjunctive on its own is likely to be a jussive subjunctive (lets do X), a wish (if only we could do X), or a deliberative question (what are we to do?). 

The subjunctive is much more often used in various types of subordinate clause.

PURPOSE CLAUSES, INDIRECT COMMANDS and FEARS FOR THE FUTURE uses the present or imperfect subjunctive by simple sequence…