Main clauses must have a subject - possibly excluding some impersonal expressions -. In subordinate clauses the subject is dropped, if it is the same as that of the main clause. In (1), there is no explicite subject between koy 'after' and kây 'go'.
(1)
Koy kây bo s-neub, nib s-mon s-yök.
after go to DEF-home, see DEF-man DEF-child
'When the man went home, he saw his children.'
I'm still considering if there should be distinct same-subject conjunctions, but maybe they are not needed.
Dlor subordinate conjunctions code factual-nonfactual-counterfactual distinction very explicitly.
koy 'ANTERIOR, FACTUAL'
dee 'ANTERIOR, NONFACTUAL'
re 'ANTERIOR, COUNTERFACTUAL'
(2)
Dee kây bo s-neub, nib s-mon s-yök.
if go to DEF-home, see DEF-man DEF-child
'If the man went home, he saw his children.'
(3)
Re kây bo s-neub, nib s-mon s-yök.
if go to DEF-home, see DEF-man DEF-child
'If the man had gone home, he would have seen his children.'
seeb 'SIMULTANEOUS, FACTUAL'
nöodl 'SIMULTANEOUS, NONFACTUAL'
dléy 'SIMULTANEOUS, COUNTERFACTUAL'
yâ 'POSTERIOR FACTUAL'
rés 'POSTERIOR, NONFACTUAL'
mul 'POSTERIOR COUNTERFACTUAL'
More conjunctions coming, just generated words