2019年英语六级语法辅导：连词

　　并列连词

　　表示意义的引申: and, both…and, not only…but(also), as well as, and …as well, neither…nor

　　表示选择: or, either…or

　　表示转折: but, while, whereas, yet, however/nevertheless(也可认为是副词)

　　表示因果: for, so, therefore, hence

　　从属连词

　　表示时间: when, while, as, after, before, since, until(till), as soon as, once

　　表示原因: because, as, since, now that, seeing that

　　表示条件: if, unless, in case, provided(that), suppose, as long as, on condition (that),

　　表示其他关系: (al)though, than, as/so…as, lest, in order that, so…that