介绍:
第十五章 神奇的“美化天使”---it
要想很好理解这条语法，还是需要把西方人的思维方式弄清楚，被动句中提到过，英语是很重视“事物”的一种语言，而中文是很重视“人”的语音，反应在中文里，我们更多用有生命的人类来作主语，而英语很多是以事物来作主语
如果一件事作主语有些时候容易出现“头重脚轻”的现象，很不美观.It不仅可以指代人，动物，还可以表示其他的事物，如天气，状况，距离等
Eg：同时取悦所有人是不可能的
To please everyone at the same time is imposssible
→It is imposssible To please everyone at the same time
Eg：保护环境很重要
To protect the environment is important
→It is important to protect the enviornment
第二节 形式主语
当主语是很长的短语或句子，为使句子美观，往往由it作形式主语，而将真实的主语谓语句子后部
Eg1:我们按时到达很重要
That we arrive on time is important
→ It is important that we arrive on time
Eg2:汤姆数学得A是个惊喜
That Tom got an A his math is a surprise
→It is a surprise that Tom got an A for his math
第三节 形式宾语
不定式为很长的to do 或doing 作宾语时，可以用it作形式宾语，不定时或现在分词短语谓语其后做尾巴.
Eg1：我认为复习课文两边是很有必要的 We think to review the lessions twice necessary
→We think it necessary to review the lessons twice
Eg2：我们相信有过海峡是可能的 They believe to swim across the straits possible
→ They believe it possible to siwm across the strais
举一反三
Eg1： She felt it her duty to take care of these orphans
Eg2: I found it difficult to finish this task in one week
大家还在听
