常用引导词：when（在…时）, as（当…时）, while（在…期间）, before（在…之前）, after（在...之后）, since（自从...以来） , not...until（直到…才）until/till(直到…时）等
特殊引导词：the minute, the moment, the second, every time, the day，the instant（ 瞬间，顷刻）, immediately , directly（不久，立即）, no sooner … than（一...就...）, hardly …when（刚一...就...） , scarcely … when（刚...就.../一...就...）,as soon as(一…就…)。
当用no sooner … than，hardly …when，scarcely … when作为引导词的时候，从句要部分倒装。
1.I didn’t realize how special my mother was until I became an adult.
直到我成为了一个成年人我才意识到我的母亲是多么的特殊。
2.While John was watching TV, his wife was cooking.
当约翰看电视时，他的妻子正在做饭。
3.The children ran away from the orchard(果园), the moment they saw the guard.
孩子们一看到守卫就逃出了果园。
4.No sooner had I arrived home than it began to rain.
我一到家就开始下雨了。
5.Every time I listen to your advice, I get into trouble.
每当我听取你的建议时，我就会惹上麻烦。
