Single word subordinators
'cause 'cept 'cos according afore after albeit altho' although because
before cept considering cos ere except for if iff immediately inasmuch
insofar lest like notwithstanding now once only provided providing save
seeing since so supposing tho' though till unless until when where
whereas whereat whereupon whether while whilst 
Multi word subordinators
as if 
as though 
according as 
in as much as 
in so far as 
inasmuch as 
insofar as 
considering that
even if 
even though 
even when 
except that
given that
in case 
in that
instead of 
now that
provided that
providing that
rather than later 
rather than  
save that
seeing as 
seeing that
so that
such that
supposing that