The subjunctive mood in English grammar includes particular verb forms that are used in certain clauses, chiefly dependent clauses, to express necessity, desire, purpose, suggestion and similar ideas, or a counterfactual condition.
In Modern English the subjunctive form of a verb is in many cases the same as a corresponding indicative form, and thus subjunctives are not a very visible grammatical feature of English. For most verbs, the only distinct subjunctive form is found in the third-person singular of the present tense, where the subjunctive lacks the -s ending: It is necessary that he see a doctor (contrasted with the indicative he sees). However, the verb be has not only a distinct present subjunctive (be, as in I suggest that they be removed) but also a past subjunctive were (as in If I were rich, …).
These two tenses of the subjunctive have no particular connection in meaning with present and past time. Terminology varies; sometimes what is called the present subjunctive here is referred to simply as the subjunctive, and, the form were may be treated just as an alternative irrealis form of was rather than a past subjunctive.
Another case where present subjunctive forms are distinguished from indicatives is when they are negated: compare I recommend they not enter the competition (subjunctive) with I hope they do not enter the competition (indicative).