Conclusion:
The infinitives and the -ed form of verbs can be used as adverbials. The infinitives and the -ed form and -ing form of verbs can also be used to express time, reason, manner, purpose, result, condition, and concession.
例如： I saw him when/ while he was going out of the room. 在他走出房间时我碰见了他。 Edison’s mother had been a teacher before she got married. 爱迪生的妈妈结婚前是位老师。
注意： no sooner… than…, hardly… when…, scarcely… when… 这三个结构意为 一 ……就…… “ ______________” ，相当于 _________ as soon as ， 均可引导时间状语从句，但只能用于 过去时 ，即主谓语用过去完成时，从句 _______ 用一般过去时。 No sooner, hardly, scarcely置于句首时， 倒装 。 主句要部分______
Adverbial clauses
状语从句在主从复合句中修饰主句的 动词 形容词 或_____ 副词 等，按意义分为 _____、_______ 时间、地点、原因、目的、结果、条件、 让步、方式、比较等状语从句。
1. 时间状语从句 引导时间状语从句的从属连词有after, as, before, once, since, till, until, when, whenever, while, as soon as, no sooner… than…, hardly… when…, scarcely… when…等，以及名词短语 the moment, the instasooner had I come home than it began to rain. Hardly /scarcely had I come home when it began to rain.
