If a Verb is put in the Subjunctive, this shows either:
(A) That it denotes something which is regarded as a thought or feeling, not as a fact (Subjunctive of Thought); or
(B) Something which, though it may be a fact, is dependent upon other facts, or cannot be separated from them (Subjunctive of Dependent Fact) ; or
(C) That it denotes something which the writer does not give on his own authority, but only as a statement of others (Subjunctive of Dependent Statement); or; lastly,
(D) That it depends in grammatical construction on an Infinitive or another Subjunctive (Subjunctive of Grammatical Dependence).
§ 188. The Subjunctive in Simple Sentences.—The Subjunctives found in simple sentences all belong to type (A). The Subjunctive expresses either (I) Desire (the Negative is nē), or (II) Imagination or Supposition (the Negative is nōn).
§ 189. I–Subjunctive of Desire.—This is found—
(1) In Wishes or Hopes: mŏrĭăr may I die! ŭtĭnam nē fēlix sit O that he might not be happy!
(2) In Requests or Commands: nē fēcĕrīs hōc pray do not do this; ăbĕăt let him go away; nē ăbĕăt let him not go away; hōc nē făcĭāmŭs let us not do this.
§ 190. II—Subjunctive of Imagination.—hōc vĕlim I could wish this; īnsānum pŭtes you might think him mad or he might be thought mad. See also § 383.
So in the Principal Clause of a Complex sentence: respondĕam sī rŏgēs I should answer if you asked me; respondissem sī rŏgāssēs I should have answered if you had asked me. In both sentences it is implied that I am not asked. See § 239.
For the Subjunctive in Dependent Clauses, see § 217 sqq.
§ 191. Commands and Prohibitions.—The Subjunctive does not express a command as strongly as the Imperative. Hence abĕăt is
