表示时间就是时间状语、表示地点就是地点状语、表示原因就是原因状语、表示条件就是条件状语.如：He often gets up at seven am on Sundays.时间状语They are playing football on the playground.地点状语He didn't go to school yesterday(时间状语）（ because he was ill）.原因状语If it doesn't rain tomorrow(条件状语）,I'll go with you.
时间状语 i've been there when i was a boy.地点状语 i went where is very pretty.原因状语 he went away because his father want to hit him条件状语 i will give your gift if you pass the examination.
1． 时间状语从句 常用引导词：when, as, while, as soon as, before, after, since , till, until 特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than,...
