Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

illume

conjunction. when, whenever, at the time that

Qenya [PE22/121; PE23/097; PE23/110] Group: Eldamo. Published by

illume e·kestanen/kestanelyanen, ni·tulle

when/if he (had) asked me, I came

íqallume

adverb. when, whenever

ia

adverb. ever

Qenya [Ety/EY; Ety/GEY] Group: Eldamo. Published by

man(an)

adverb. when

The correlatives manan or man “when” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109), a combination of interrogative ᴹQ. ma and ᴹQ. -n(an) “time”.

Neo-Quenya: For purposes of Neo-Quenya I would stick to ᴹQ. mallume, since I think -n(an) was abandoned.

Qenya [PE23/109; PE23/110] Group: Eldamo. Published by

oi

adverb. ever

íqa

conjunction. when, whenever

Qenya [PE22/121; PE23/097] Group: Eldamo. Published by

íre

conjunction. when