[语法资料] [作业] 白勇之句子结构（全），欢迎讨论。

1. Often visible as smog, ozone is formed in the atmosphere when hydrocarbons and nitrogen oxides, two major pullutants emitted by automobiles, react with sunlight.

句子结构：
主语ozone；谓语is formed ；
状语从句 whenXXX，做状语。
Often visible as smog -- 形容词短语，做表语，修饰主语。
in the atmosphere -- 介词短语，做状语，修饰谓语。
when hydrocarbons and nitrogen oxides, two major pullutants emitted by automobiles, react with sunlight -- 疑问词从句，做状语，修饰谓语。
hydrocarbons and nitrogen oxides -- 名词并列，做状语从句的主语。
two major pollutants （that are）emitted by automobiles -- 名词短语，加上定语从句的省略，做从句主语的同位语。
react with sunlight -- 动词加上介词+名词短语，
做从句的谓语。

2. Quasars, at billions of light-years from Earth the most distant observable objects in the universe, are believed to be the cores of galaxies in an early stage of development.

句子结构：Quasars 名词-主语，are believed to be被动语态-谓语， the cores 名词-表语
at billions of light-years from Earth -- 插入语，介词短语-状语，修饰主语
the most distant observable objects -- 名词短语，同位语，修饰主语
in the universe -- 介词短语，状语，修饰同位语
of galaxies -- 介词短语，定语，修饰表语
in an early stage of development -- 介词短语，状语，修饰galaxies。

3. Computers are becoming faster, more powerful and more reliable, and so too are modems, the devices to allow two or more computers to share information over regular telephone lines.

句子结构：Computers， modems -- 名词并列，主语； are becoming 谓语； faster, more powerful and more reliable 形容词并列，表语。
so too 状语，引起倒装，修饰主语modems。
the devices to allow two or more computers to share information over regular telephone lines. -- 名词，同位语，修饰modems。
to allow -- 动词不定式，定语，修饰同位语the devices。
two or more computers -- 同位语中allow的宾语。
to share information over regular telephone lines -- 同位语中的allow的宾语补足语
over regular telephone lines -- 介词短语，宾语补足语中的状语。

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