-vë, (3) apparently an ending used to derive adverbs from adjectives (see andavë under anda and oiavë under oia). May be related to the preposition ve "as, like".
Quenya
yallë
conjunction. as, like, [lit.] in the same way as
a carnë ta yallë b (carnë)
A did that as / like B (did)
-vë
as, like
ier
as
ier prep. "as" (VT43:16, probably rejected in favour of sívë, q.v.). In an abandoned version of the Quenya Lord's Prayer, Tolkien used ier...ter for "as...so" (VT43:17).
sívë
as
sívë (1) prep. "as", apparently ve of similar meaning with the prefix sí- "this, here, now"; sívë therefore makes a comparison with something close, whereas tambë (q.v.) refers to something remote. Sívë...tambë "as...so" (VT43:17). Elided sív' in VT43:12, since the next word begins in the vowel e-.
ve
as, like
ve (1) prep. "as, like" (Nam, RGEO:66, Markirya, MC:213, 214, VT27:20, 27, VT49:22); in Narqelion ve may mean either "in" or "as". Ve fírimor quetir *"as mortals say" (VT49:10), ve senwa (or senya) "as usual" (VT49:10). Followed by genitive, ve apparently expresses "after the manner of": ve quenderinwë coaron ("k") "after the manner of bodies of Elven-kind" (PE17:174). Tolkien variously derived Quenya ve from older wē, bē or vai(VT49:10, 32, PE17:189)
ya
as
ya (2) or yan, prep. "as" (VT43:16, probably abandoned in favour of sívë)
ye
as
[ye (3), also yé, prep. "as" (VT43:16, struck out; in the text in question Tolkien finally settled on sívë, q.v.)]
A word for “as, like” or more literally “in the same way as”, a combination of the relative pronoun ya and the suffix -llë related to lé “way, method, manner” (PE17/74).
Conceptual Development: Demonstrative, Relative, and Correlative Stems (DRC) from 1948 instead had ᴹQ. íl or ilde of similar meaning, but using the earlier suffix -l(de) (PE23/111).