1When people in developing countries worry about migration, they are usually concerned at the prospect of their best and brightest departure to Silicon Valley or to hospitals and universities in the developed world.
主干主语：people；谓语：worry；宾语：migration。主句：they are concerned at the prospect of their departure。
结构这是一个时间状语从句与主句结构复杂的复合句。当从句是时间状语从句，主句是be concerned at the prospect of + 名词短语的固定结构。'prospect of their departure' 作介词短语修饰 concerned，'best and brightest' 是定语修饰 'departure'，'departure to Silicon Valley or to hospitals and universities' 是动词短语作宾语，'in the developed world' 是后置定语修饰前面的目的地短语。句中包含时间从句、主句的介词结构和修饰关系，容易混淆修饰范围。
译文当发展中国家的人们担心移民问题时，他们通常担心的是自己最优秀、最聪明的人前往硅谷或发达世界医院和大学的远景。
考点时间状语从句的倒装或省略问题 · be concerned at the prospect of 固定搭配
2These are the kind of workers that countries like Britain, Canada and Australia try to attract by using immigration rules that privilege college graduates.
主干主语：These；谓语：are；宾语：the kind of workers。定语从句修饰 workers。
结构这是一个带有双重定语从句的复杂句子。主句是 'These are the kind of workers'，'that countries like Britain, Canada and Australia try to attract' 是非限制性定语从句修饰 'workers'，'by using immigration rules' 是方式状语，'that privilege college graduates' 是第二个定语从句修饰 'rules'。句中存在两个定语从句嵌套，'like Britain, Canada and Australia' 是插入修饰，容易误判哪个从句修饰哪个成分。
译文这些就是英国、加拿大和澳大利亚等国通过移民政策优先录取大学毕业生来吸引的那种类型的人才。
考点定语从句嵌套结构 · 非限制性定语从句的功能
3A big survey of Indian households in 2004 found that nearly 40% of emigrants had more than a high-school education, compared with around 3.3% of all Indians over the age 25.
主干主语：A big survey；谓语：found；宾语：that nearly 40% of emigrants had more than a high-school education。比较状语：compared with around 3.3% of all Indians over the age 25。
结构这是一个含有宾语从句和比较状语的复合句。主句是 'A big survey ... found that ...'，'that nearly 40%...' 是宾语从句，'compared with around 3.3% of all Indians over the age 25' 是比较状语从句，'compared with' 引导比较，'over the age 25' 是后置定语修饰 Indians。句中存在主句、宾语从句和比较状语，'compared with' 容易被误读为并列结构。
译文2004年对印度家庭的一项大规模调查发现，近40%的移民受过高中以上教育，而25岁以上所有印度人的比例仅为3.3%。
考点宾语从句的引导词 that · 比较状语从句的倒装或省略
4They fear that it hurts their economies, depriving them of much-needed skilled workers who could have taught at their universities, worked in their hospitals and come up with clever new products for their factories to make.
主干主语：They；谓语：fear；宾语：that it hurts their economies。结果状语：depriving them of much-needed skilled workers。定语从句修饰 workers。
结构这是一个含有宾语从句、结果状语和定语从句的复合句。主句是 'They fear that it hurts their economies'，'that it hurts their economies' 是宾语从句，'depriving them of much-needed skilled workers' 是现在分词独立结构作结果状语，'who could have taught at their universities, worked in their hospitals and come up with clever new products for their factories to make' 是定语从句修饰 'skilled workers'，包含三个并列动词不定式。句中包含宾语从句、现在分词结构和定语从句，容易误解 'depriving' 的逻辑主语。
译文他们担心这种情况会损害他们的经济，导致失去急需的熟练工人，这些人本可以教书、进医院工作并为工厂发明新产品。
考点现在分词独立结构作状语 · 定语从句的先行词和修饰范围