The subjunctive mood expresses the speaker's attitude towards uncertain or hypothetical situations and is used to convey will, influence, emotion, doubt, denial, indefiniteness and nonexistence. It is also used in impersonal expressions in the present tense subjunctive. The document discusses the present subjunctive mood and its uses in impersonal expressions.

1. Present Subjunctive Subjunctive mood expresses the speaker’s mood toward attitudes, the uncertain, and hypothetical. Also used to express will and influence, emotion, doubt disbelief, and denial, and indefiniteness and nonexistence.

2. Present Subjunctive Impersonal Expressions