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.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. 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).