2018年6月英语四级阅读200篇：如何查看国际航班安全
本句是分别由and和but连接的三个简单句。后一句中buying tickets现在分词作状语表示时间，前面可以加when或while。
语法重点：分词短语作状语
2. It's been a bad year for aviation fatalities, with more than 700 people killed in 16 crashes around the world so far in 2009.
本句是一个简单句。其中 with more...in 2009是独立主格结构，对主句进行补充说明，结构为 with+名词+过去分词+状语。
语法重点：独立主格结构
3. Though its focus started as an airline-by-airline evaluation, the EU has moved more toward building the blacklist on evaluations of entire countries-all airlines from 15 countries have a blanket ban行om the EU and are among the 233 cited.
本句是一个复合句。主句是the EU...are among the 233 cited，破折号后面的句子是对前面句子的补克说明，其中from 15 countries介词短语作后置定语，修饰airlines。 cited过去分词短语作后置定语，修饰233。Though引导让步状语从句。
语法重点：介词短语作定语，过去分词作定语，让步状语从句
4. US and EU regulators accept IOSA certification to meet requirements that airlines funneling passengers to each other through code-sharing agreements audit each other for safety issues.
本句是一个复合句。主句是US and EU...meet requirements. that引导同位语从句，解释说明requirements.其中funneling passengers...code-sharing agreement现在分词短语作后置定语修饰airlines.
语法重点：同位语从句，分词短语作定语
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