talantië vb. "he is fallen" (FS; see -ië #2 concerning the doubtful authority of this stative verb ending in LotR-style Quenya)
he is fallen
slipping, sliding, falling down
talat- vb. a stem used for "slipping, sliding, falling down" (Letters:347), cf. atalta-, talta- and talantië
-ië (3) "is", -ier "are", stative verb suffix occurring in Fíriel's Song: númessier "they are in the west", meldielto "they are...beloved", talantië "he is fallen", márië "it is good" (< *númessë "in the west", melda "beloved", *talanta "fallen"); future tense -iéva in hostainiéva "will be gathered" (< *hostaina "gathered"). Compare ye "is", yéva "will be", verbs that also occur in Fíriel's Song. This suffix is probably not valid in LotR-style Quenya: -ië is an infinitival or gerundial ending in CO, for ye "is" Namárië has ná, and the phrase "lost is" is vanwa ná, not *vanwië.
ná (1) vb. "is" (am). (Nam, RGEO:67). This is the copula used to join adjectives, nouns or pronouns "in statements (or wishes) asserting (or desiring) a thing to have certain quality, or to be the same as another" (VT49:28). Also in impersonal constructions: ringa ná "it is cold" (VT49:23). The copula may however be omitted "where the meaning is clear" without it (VT49:9). Ná is also used as an interjection "yes" or "it is so" (VT49:28). Short na in airë  na, " is holy" (VT43:14; some subject can evidently be inserted in the place of .) Short na also functions as imperative: alcar mi tarmenel na Erun "glory in high heaven be to God" (VT44:32/34), also na airë "be holy" (VT43:14); also cf. nai "be it that" (see nai #1). The imperative participle á may be prefixed (á na, PE17:58). However, VT49:28 cites ná as the imperative form. Pl. nar or nár "are" (PE15:36, VT49:27, 9, 30); dual nát (VT49:30). With pronominal endings: nányë/nanyë "I am", nalyë or natyë "you (sg.) are" (polite and familiar, respectively), nás "it is", násë "(s)he is", nalmë "we are" (VT49:27, 30). Some forms listed in VT49:27 are perhaps to be taken as representing the aorist: nain, naityë, nailyë (1st person sg, and 2nd person familiar/polite, respectively); does a following na represent the aorist with no pronominal ending? However, the forms nanyë, nalyë, ná, nassë, nalme, nar (changed from nár) are elsewhere said to be "aorist", without the extra vowel i (e.g. nalyë rather than nailyë); also notice that *"(s)he is" is here nassë rather than násë (VT49:30).Pa.t. nánë or né "was", pl. náner/nér and dual nét "were" (VT49:6, 9, 10, 27, 28, 30, 36). According to VT49:31, né "was" cannot receive pronominal endings (though nésë "he was" is attested elsewhere, VT49:28-29), and such endings are rather added to the form ane-, e.g. anen "I was", anel "you were", anes "(s)he/it was" (VT49:28-29). Future tense nauva "will be" (VT42:34, VT49:19, 27; another version however gives the future tense as uva, VT49:30). Nauva with a pronominal ending occurs in tanomë nauvan "I will be there" (VT49:19), this example indicating that forms of the verb ná may also be used to indicate position. Perfect anaië "has been" (VT49:27, first written as anáyë). Infinitive (or gerund) návë "being", PE17:68. See also nai #1.
ye (2) copula "is" (FS, VT46:22); both earlier and later sources rather point to ná (q.v.) as the copula "is", so ye may have been an experiment Tolkien later abandoned. Future tense yéva, q.v.
úyë vb., a form occurring in Fíriel's Song (cf. VT46:22), apparently ye "is" with the negative prefix ú-, hence "is not" (úyë sérë indo-ninya símen, translated "my hearth resteth not here", literally evidently *"[there] is not rest [for] my heart here")