分詞構句中,附屬連接詞不可省略者如unless ,once, as, even if, though,until 可否再舉詳例?

In participle construction, subordinating conjunction demanded;eg:-
unless---conj=if not, except when;
eg:-Unless bad weather stops me, I go for a walk.
once---conj=for one time, on one occasion, only;
eg:-We go to the cinema once a week.
as---conj=when, while:-
eg:-I saw her as she was getting off the school bus.
even if---used to call attention;
eg:-I'll get there even if I have no time.
though---conj=in spite of the fact that;
eg:-Though you are so poor, you have enough to spend on eating.
until---conj, prep=till;
eg:-Let's wait until the rain stops.