1. 两空常填连词
表原因：now that;
表让步：even if / even though
表方式：as if / as though / just as
表目的：so that / in case
表结果：so that
定语从句中：介词 + which
表条件：what if
表除了：except when/that
2. 三空常填连词
表目的：in order that / for fear that
表时间：
as soon as表条件：as/so long as / on condition that
特别注意：no matter how + adj./ no matter what + n.
3. 两空常填介词
表原因：because of/ due to/ owing to/
表让步：regardless of
表递进：apart from
表相反：instead of/ rather than
表除了：except for / other than
4. 三空常填介词
表让步：in spite of
表递进：in addition to
5. 两空常填
情态动词have to / had better / wouldrather / ought to / may/might (as) well