213. In early Greek ὅς, ἥ, ὅ was demonstrative, like ὁ, ἡ, τό (§ 205). In Attic it retains this force in a few phrases (§ 560), but is commonly relative, meaning who, which, that. The forms are:
215. To the demonstratives in §§ 211 and 212 correspond the relatives
| οἷος, | οἵᾱ, | οἷον | of which kind, (such) as | 
| ὅσος, | ὅση, | ὅσον | of which size or number, (as great or many) as | 
| ἡλίκη, | ἡλίκον | of which age or value | 
216. The enclitic particle -περ added to a relative pronoun (or adverb; see § 236) makes more distinct the reference to the antecedent, which is thereby emphasized.
ὅπερ  which very thing, the very thing which
ὥσπερ  just as
θέλω ἅπερ σύ
I wish the very things that you do.
Eur. Ipheginia in Tauris, 991
 
    
 
