requirement, stipulation
condition, supposition
or a choice
expressing a polite request
expressing an opinion
expressing surprise or regret
a hypothetical situation
(an indirect question)
whether
despite
the possibility that
no matter whether
whenever
even though
every time…
given that
in the event that
(with implied reservation)
and perhaps not
admitting being possible
but relatively insignificant…
despite being
despite being
supposing that
assuming that
as…
even…
… and when
… anything
… I were you
… only
… not
… so be it