pl1. hain _pron. _that, the thing previously mentioned. Tolkien notes "hain = heinn (< san-)" (PE17:42). Im Narvi hain echant 'I Narvi made them'.
Sindarin
i
that
han
that
san
pronoun. that
sa
pronoun. that
taw
that
(demonstrative pronoun) ?taw. _Only the ”Old Noldorin” form tó is actually given in LR:389 s.v. _
taw
pronoun. that
taw
that
. Only the ”Old Noldorin” form tó is actually given in LR:389 s.v.
(+ soft mutation), basically in in the plural, but often loses the n which is then replaced by nasal mutation of the next consonant (e.g. gyrth i chuinar ”dead that live [cuinar]”, Letters:417). Sometimes i (+ soft mutation) is used in the singular as well. – The form ai (following by lenition) occurs in the phrase di ai gerir ✱”those who do” (VT44:23). Possibly it is a form of the relative pronoun that is used when the previous word ends in -i. Whether ai is both sg. and pl. is unclear; in its one attestation it is followed by a plural verb that is lenited.