The Middle is properly _reflexive_. Some of its tenses have an
_active_ meaning. A few verbs, called _deponent_, are
throughout pass. in form, but act. or mid. in meaning.

§ 41. There are five MOODS in each voice, the _Indicative,
Imperative, Subjunctive, Optative,_ and _Infinitive_, to which
may be added the _Participles_; they are mostly known by means of
the _union-vowel_--that which immediately precedes the
termination.

§ 42. The Indic., Imper., Infin., and Participles correspond to the
English, and have a _short_ union-vowel, (ε, ο, or α,) except
the Perf. and Pluperf. pass., which have no union-vowel; the
Pluperf. act. and mid., which have ει; and the Aorists pass., which
have η or its equivalent.

§ 43. The Imper. has but two persons. 2d and 3d. The Infin. has but
one termination for all numbers and persons, and is very often used as
a neut. noun, with the article, etc., yet retaining its construction
as a verb.

§ 44. The Subj. and Opt. are used in certain _dependent_
relations, like the English subjunctive and potential; the former has
a _long_ union-vowel, (η or ω,) and the latter a diphthong,
(οι, αι, or ει.) The former generally represents an act as
contingent upon outward circumstances, and the latter upon a will.

§ 45. The TENSES are nine, the _Present, Imperfect, Perfect,
Pluperfect,_ two _Aorists_, (1st and 2d, equivalent in sense,)