时间状语从句连接词:when, while, as, before, after, as soon as, till, until, not…until, the first/second…/last time, the moment, the minute, the instant, immediately, directly, instantly, hardly…when, scarcely…when, no sooner…than 条件状语从句连接词:if, unless, now (that), as(so) long as, in case, on condition that, suppose/supposing, provided/providing