The subordinating conjunctions are the part of
speech that joins the dependent clause to the independent clause.
after
Although as as if
as long as as much as
as soon as as though
assuming that because
before By the time
even though how
if in case
in order lest
now that Once
only if provided that
rather than since
than till
unless until
whatever when
whenever where
whereas whether
which while
who whom
whomever whose