since 是从属连词还是并列连词答:nor, so, therefore, yet, however, for, hence, as well as, both…and, not only…but also, either…or, neither…nor, (and)then等等。从属连词有 after, although, as, because, before, if, lest,once, since, that, till, unless, until, when, where, whether, while 等 ...