A School Grammar of Attic Greek

Thomas Dwight Goodell

COMPLEX SENTENCES/ Εἰ Clauses

645. What is stated not as a fact but as a supposition, assumed in order to base upon it another statement, is called a condition; any word or form of words that so states something is a conditional expression. Common conditional expressions in English are such as begin with if, unless, suppose, in case, on the chance that, whoever, whenever, etc.; inversion of subject and predicate may have the same meaning, as Were I Brutus, or Should you ask me.1 Several forms of conditional expression in Greek, used for stating a supposed case, have been already noted (481, 616, 618, 620, 627, 629, 630, 631); but the fullest and most distinct form is the εἰ clause. A conditional sentence consists of a conditional clause or condition (protasis) and a principal clause, the conclusion (apodosis).

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Notes
1
Other frequent forms of condition are illustrated in
What matter, so I help him back to life.--TENNYSON, Lanc. and El.
Not without she wills it.--TENNYSON, Lanc. and El.
Man gets no other light,
Search he a thousand years.--M. ARNOLD, Emped.
Imperative and interrogative sentences, in both English and Greek, sometimes have the same office.