老师好，有以下问题想请教一下。5.
It's impolite of you to visit someone without telling him in advance.其中
impolite to visit是形容词短语吗to
visit修饰系表结构吗（我翻老师们以前的回答看到的概念），还是直接it是形式主语呢，adj+不定式和形...
...lion complications of thinking about this lecture is
indeed to what extent it really isa significant departure from the work of
structuralism.
老师,我看不懂这个句子, 它该如何断句理解? "is indeed to what extent it really isa
significant departure" 这部分的结构如何划分? ...
...这样一组问答：问：有这样一道选择题：(1) _________, she has some shortcomings. A. Although she isan advanced workerB. An advanced worker as she is C. Advanced worker as she is D. She isan advanced worker 答案是B, 我认为A也对。请赐教。答：A与C (书面语)都对...
...ed treatment, and cited the backlash the UK prime minister, Boris Johnson, has faced for clearing his senior adviser of breaking UK quarantine rules.句中of breaking UK quarantine rules在句中做什么成分？谢谢回答
...f confidence across our land,
a nagging fear that America's
decline is inevitable ,and that the next generation must lower its sights.问: a sapping 和a nagging fear为什么只算一个主语，谓语动词用的是is? a nagging fear做的是什么成分？是同位语吗？
Doctors can not provide ( )medical care to their patients without the help of numerous other medical employees.A.effectingB.efficientC.effectiveD.effected
Last, good performance isnot defined by employees’ locations at specific times of the day but by what they achieve—what Mr Bloom calls “managing outputs, not inputs”.破折号后是对前面的补充说明，那么能不能说what引导的是同位语从句？谢谢各位老师。
Use of public transportation is the highest ithas been in almost 60 years in almost every American city.请问是否为补语前置，正常的句序是这样吗？Ithas been the highest use of public transportation in almost 60 years in almost every American city. 谢谢各位老师!
The villagers and towns were usually perched on the edge, so as not to waste arable soil and because there was a need to live beyond the reach of the annual floods.这里and because为什么可以这么用？