③适用从句：时间、地点、让步、条件、方式等状语从句

　　④省略后从句的形式：连词＋分词/不定式/介宾短语/名词/副词/形容词

句式仿写

①当在大街上行走时，这个男孩遇到了他的老师。

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②如果被给予更多时间的话，我们会做得更好。

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3．If the call was really about nothing，then why was it so important as_to interrupt your conversation and waste your precious time？

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句中含有"so＋adj./adv.＋as to do sth."结构，该结构表示结果，否定形式用"so＋adj./adv.＋as not to do sth."。

　　She was so kind as to help the old lady off the bus.

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　　Rose wouldn't be so careless as to leave her keys in the classroom.

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　　He was so proud as not to steal.

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　　①"so＋adj./adv.＋as to do sth."可与句型"so＋adj./adv.＋that..."进行转换。

　　②so as to do"以便做某事"，表示目的，so as可省略，相当于in order to do。其位置一般在句中，不能位于句首。否定结构用so as not to。

　　③"such as to"和"such＋n.＋as to"表示结果，否定结构是在to前加not。

　Their anxiety was such as to make them unable to sleep.

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My friends were so kind as to help me out.＝My friends were so kind that they helped me out.

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4．While these messages always seem important at the time，most people cannot really remember them the next day.

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while在此作从属连词，意为"尽管"，引导让步状语从句。从句常位于句首。

　　While I admit it's difficult，I can solve it.

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