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英语六级语法精要：连词 连词 并列连词 表示意义的引申: and, bothand, not onlybut, as well as, and as well, neithernor 表示选择: or, eitheror 表示转折: but, while, whereas, yet, however/nevertheless 表示因果: for, so, therefore, hence 从属连词 表示时间: when, while, as, after, before, since, until, as soon as, once 表示原因: because, as, since, now that, seeing that 表示条件: if, unless, in case, provided, suppose, as long as, on condition , 表示其他关系: though, than, as/soas, lest, in order that, sothat | 
