表示对照的连词:on the contrary, in contrast, by contrast, in comparison, by comparison, conversely
表示补充的连词:also, further, furthermore, likewise, similarly, moreover, in addition, what’s more, too, either, neither, not…but…, not only…but also…
表示时间顺序的连词:when, while, as, after, before, since, until, as soon as, once
表示目的的连词:that, so that, in order that, lest, for fear that
表示条件的连词:if, suppose (that), supposing (that), unless, in case, so (as) long as, so far as, on condition (that), provided (that), providing (that)