if, unless(=if …not), so\as long as, in case, on condition that, suppose\supposing, provided that方 Nhomakorabea状语从句
as, as if, as though
让步状语从句
although\though, even though\even if, whether …or…
3.If+主语+should do
主语+should\would\could\might
+do
状语从句连接词
时间状语从句
when, while, as, before, after, till\until, since, as soon as, immediately\instantly, the moment\minute\instant, not …until\till
定语从句、名词性从句连接词
从句缺少成分
定语从句
名词性从句
主语\表语
that (人、物), who, which, what
who（人）,which（物）, what
宾语
that, whom, which, what
whom（人）, which, what
定语
whose
whose（人/物）
状语
when, where, why, how
so that, in order that, for fear that, in case, lest, for fear that\in case\lest
结果状语从句
so that, so…that…, such…that…, too…to…, enough to…, so… as to…
条件状语从句
虚拟语气
虚拟条件句
主句
与现在事实相反
If+主语+did\were
主语+should\would\could\might +do
与过去事实相反
If+主语+had done
主语+should\would\could\might
+have +done
与将来事实相反
1.If+主语+did
2.If+主语+were to do
when, where, why, how
不缺成分
that, whether(… or not) , if
注：先行词在定语从句中做宾语可以省略
句首和介词后之用whether不用if
地点状语从句
where, wherever
原因状语从句
because, as, since, now( that), for, seeing( that), considering( that), in that, because of, thanks to, due to, owing to
目的状语从句